B. GRAMMAR & VOCABULARY 
* Choose the best answer A, B, C or D to complete the sentence.  
1. We should turn off the lights before going to bed to ______ electricity.
A. cut                                         B. save                             C. take                       D. waste

2. People need to find some other means of _______ to deal with traffic jams. 
A. transport                              B. communication            C. payment

3. ______ is a non-renewable energy source. 
D. expression
A. Wind                                   B. Tide                              C. Oil    

4. A teleporter is eco-friendly, so it doesn’t cause ________. 
D. Sun
A. unpolluted                           B. polluted                        C. pollute

5. We should put _____ on our roof for the heating and hot water.
D. pollution 
A. solar energy                         B. equipment                    C. cracks 

6. When your electric car  ____ , it will need to be recharged. 
D. solar panels
A. goes out                               B. runs out                       C. eats out
D. finds out


7. Many countries in the world ______ wind power on a commercial basis today.
A. used                                       B. will use                        C. are using               D. uses

8. We must ______ the amount of water our family use every day.
A. reduce                                    B. increase                        C. improve                D. expand

9. A bamboo-copter runs  _____ electricity, so it is safe for the environment.
A. away                                      B. on                                C. after                      D. down

10. Ben and I ______ the Internet at the moment.
A. surf                                        B. surfing                          C. are surfing            D. to surf

11. ______ the swans swimming in the lake now?
A. Do                                         B. Is                                  C. Does                     D. Are

12. How often ___ your sister ride a skyTran to work?
A. does                                       B. is                                  C. do                          D. are

13. Look! They ______ a new spaceship.
A. launch                                    B. will launch                   C. are launching        D. launched

14. Normally at this time her brother _____ the vegetables in the garden, but today he ____ in the kitchen. 
A. is watering/ is cooking    B. water/ is cooking    C. waters/ cooks   D. is watering/ is cooking

15. At present, my city ______ metro stations on Ben Thanh - Suoi Tien line.
A. build                                      B. builds                           C. is building             D. to build

16. We will cut down on the use of natural gas because it is __________ and harmful to the environment.
A. plenty                      B. limited                          C. available               D. abundant
                    
17. We will ___________ a boat around the island if we visit it.
A. get                         B. take                              C. fly                          D. sail

18. If we go on __________ electricity, we will have to pay a lot next month.
A. wasting                                  B. turning off                    C. turning on             D. making

19. You _____ have to worry about bad weather when you travel in hyperloops. They are safe and fast.
A. won’t        B. will           C. are            D. may

20. Electric cars don't pollute the environment because they don't have _______.
A. roof                                       B. wheels                         C. pedals                    D. fumes