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.