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13.You should clear _____ all the trash on the ground before leaving.

A. over                          B. up                             C. off                          D. out   

 

14. If there is a mechanical problem, we suggest _________ the manufacturer directly.

 

A. installing                        B. contacting                      C. replacing                     D. dripping

 

15. Our energy will soon come to an end if we don’t__________  it.

 

A. use                            B. save                          C. spend                     D. take

 

16. In order to save electricity, an ordinary 100-watt light bulb can be replaced by ______.

 

A. a 1000-watt light     B. a lamp                      C. an electric bulb       D. an energy-saving bulb

 

17. I suggest using energy-saving bulb__________ our electricity bill

 

A.    to reduce                       B. to replace                       C. to prohibit                    D. to cope

 

18. Energy can be collected by solar __________ on sunny days.

 

A. boards                      B. panels                       C. bars                        D. sheets

 

19. If we don’t find _____ sources of power, we will use up all the fossil fuels in the near future.

 

A. effective                         B. efficient                         C. natural                        D. alternative

 

20. _______________he has been absent frequently; he has managed to pass the test.

 

A. Because                        B. Because of                     C. But                            D. Though

21. Pesticides are chemicals poisons used by farmers to kill weeds and insect pests, ________ some

 

pesticides are still in the food when it gets to the market.

 

A. so                             B. because                   C. and                         D. however

 

22. There will be a _______cut tomorrow in HCMC to save electricity.

 

A. mass                         B.  faucet                    C. energy                     D. power

 

23. He is very stubborn, so it will be difficult to _______ him to go.

 

A. persuade                   B. suggest                   C. make                       D. prevent

 

24. “I suggest fixing the dripping faucet.” “___________”

 

A. We will.                    B. Good idea!             C. Yes, please.            D. I’m afraid not.


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