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18. Acupuncture is considered to be very safe when enough precautions are taken.
A. unhealthy B. comfortable C. dangerous D. sore

19. She contributed an enormous amount of money to charity.
A. small B. tiny C. sociable D. large

20. It is advisable that everyone in family shares the household duties. "Duties" means _____
A. views B. ideas C. jobs D. chores

21. The ancient houses _____ by the fire. They are now under reconstruction.
A. were destroyed B. destroyed C. have destroyed D. were destroying

22. The telephone _____ by Alexander Graham Bell.
A. is invented B. is inventing C. invented D. was invented

23. Lots of houses _____ by the earthquake.
A. are destroying B. destroyed C. were destroying D. were destroyed

24. _____ by your father?
A. Did that book write B. Did that book written C. Was that book written