Circle the best option (A, B, C or D) to complete the following sentences:

1. If we ______ soon, the pollution will get much worse.

A. don’t act B. didn’t act       C. will not act D. hadn’t acted

2. __________pollution makes us unable  to see the stars in the sky.

A. water     B. soil    C. light    D. air

3. If my home installed a solar water heater, we_________a lot of energy.

A. would save    B. will save    C. saved    D. save

4. English is the ___________ language of many countries such as the US, the UK, and Australia.

A. international        B. usual                      C. popular                 D. official

5. Poisonous ___________ from factories can kill a lot of wildlife animals.

A. things                    B. animals                 C. chemicals             D. nations

6. When I was a child, I ..............follow my Mom to the market.

A. used to                  B. use                         C. get used to            D. use to

7. Oh, that dress is nice. Where .............. it?

A. do you buy           B. are you buy          C. did you buy          D. you buy

8. Lan promises she _________ her best in learning English.

A. try                          B. will try                  C. trying                     D. tries

9. Australia has the biggest ____________ in the world.

A.natural beauty       B.puzzling games         C.cattle station       D. tradition

10. In summer, children often take part in a local or international ____________.

A.summer camp          B.game           C.attraction             D. dances