IV. In the following text, six sentences or parts of sentences have been removed. Above the extract you  will find the six removed sentences PLUS one sentence which doesn't fit. Choose from the sentences (A G) the one which fits each gap (1-6). Remember, there is one extra sentence you do not need to use.  Write the correct letter in the box. 

Choose from the following sentences to fill the spaces in the text. There is ONE extra. A. Using a microwave for cooking a large food mass is difficult due to limited penetration of microwaves. B. This can be overcome by leaving the food to stand for a few minutes when cooking is completed. C. It is advised that the water should be poured slowly into another container that already contains the  powder. 

D. In this way, buying a microwave oven with a turntable ensure the food is cooked throughout. E. Conversely the microwaves do not heat glass, ceramic and plastic containers. 

F. If the microwaves are not absorbed inside the oven, the oven can be damaged by electrical arcs and  overheating of the microwave source. 

G. When water in that state is disturbed, it can suddenly and unexpectedly boil violently. MICROWAVING 

Microwaving is a method of cooking where food is bombarded by microwaves, usually within an appliance  called a microwave oven which excite the water, fat and sugar molecules, thereby heating (cooking) both  the outside and center of the food at the same time. (1)………………… 

(A common myth is that a microwave oven cooks from the center of the food outward. This appears to  happen because heat generated at the surface escapes more readily from the surface of the food into the  surrounding air.) One advantage of microwaving is that small amounts of food can be heated very quickly,  making it useful for reheating leftovers. 

The disadvantage is that food which is microwaved does not undergo some of the chemical reactions, such  as browning, which makes the food visually attractive. Primitive microwave ovens often do not cook evenly, 

leading to a concern that bacteria easily killed by more traditional cooking methods may survive the quick  cooking time in "cold spots", though the food item as a whole is cooked to a safe average temperature. (2)  …… 

Some high-end microwave ovens are combined with a convection oven which basically cook the food using  microwave and hot air simultaneously to achieve both the fast cooking time and browning effect. (3) ………………… 

However microwave ovens are used in some fast food chains and special microwave bags are available for  cooking fowl or large joints of meat. 

Professional chefs generally recommend using microwaves for a limited set of tasks, including: melting fats  (such as butter) and chocolate, cooking grains like oatmeal and grits, cooking rice, thawing frozen meats  and vegetables before cooking by other methods and quickly reheating already-cooked foods. Using a microwave to boil water is potentially dangerous, due to superheating. In a microwave, water can  be raised quickly to a temperature above the boiling point before major bubbles form, especially if it is  purified and in a very clean glass vessel. (4) ………………… 

This effect is rare, even for scientists who try to deliberately recreate it, and any seed whatsoever for  boiling is likely to prevent the problem. Boiling water with, for instance, a teabag already in it will prevent  any dangers by providing a seed, as will using a mug that is not perfectly clean. 

The risk greatly increases when water has already been boiled once in the same container. This situation  can occur if the user of the oven boiled the water once, forgot about it, then came back later to boil it again.  The first time the water boils, the seed bubbles (microscopic bubbles of air around which larger steam  bubbles grow) are used up and largely eliminated from the water as it cools down. When the water is  heated again, the lack of seed bubbles causes superheating, and a risk of a steam explosion when the water's  surface is disturbed. 

Placing something in the water before heating can mostly alleviate this risk. If you are planning to mix  something with the water, say tea or hot chocolate, adding it before heating will insure that the water boils.  Otherwise, placing a wood object, for instance a chopstick, in the water before heating will also work. Care should be taken when removing heated water from a microwave. Make sure that the hands are  protected from possible liquid boil-over, place the container on a level, heat-proof surface and stir liquid  with a warm spoon. Also, never add powdered substances (such as instant coffee or cocoa mix) to the  container taken from the microwave, due to the addition of all those seed bubbles and the potential for  violent, spontaneous boiling. (5) …………………  

Metal objects, such as metal utensils, in a microwave oven can lead to dangerous situations. Metals do not  absorb microwaves effectively. Instead, metals reflect microwaves, thereby preventing the latter from  reaching the food. (6) ………………… 

Thin metal layers, such as metal foil and mugs with metal trim can melt or burn due to the strong electrical  currents that are generated in metal objects. However, small solid metal objects, such as spoons, in  combination with a large amount of absorbing food or liquid, normally do not lead to problems. This article is licensed under the GNU Free Documentation License. It uses material from the Original  Wikipedia article. 

D. WRITING 

I. Rewrite the following sentences without changing the meaning of the printed sentences. 1. The phone stopped ringing the moment I got down stairs.  

→No sooner _______________________________________________