22. The Olympic _____ remind us of where the Olympics are held and the characteristics of the host country.
A. symbols B. signals C. marks D. signs
23. Experts say that the rate at which one ages ______ from person to person and is usually influenced by a number of factors.
A. is varying B. varied C. has varied D. varies
24. _____ Ashley made her first public performance on Broadway, her whole family went to see it.
A. Though B.Once C. When D. As long as
25. Recent scientific studies indicate that eating healthy food and exercising regularly ____ help prevent many diseases.
A. might B. can C. shall D. will
26. In 1888, the world's first beauty contest was held in
A. everything B. nothing C. much D. little
27. Since the baby milk powder was found to be polluted, there has been universal doubt _____ other food products are safe to eat.
A. whether B. that C. what D. how
28. After seven successful flights,
A. expects B. is expecting C. is expected D. will be expected
29. Some companies are thinking of ways to save natural _____ by making better use of the water used in the bathroom.
A. resources B. sources C. power D. energy
30. The remains of adventurer’s private airplane were reported ______, but the adventurer remained missing.
A. being found B. to be found C. having found D. to have been found
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