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• 2. A sneeze cannot be performed voluntarily, ____________ be easily suppressed.(A) nor it can (B) it
• 3. If we _____________, we won’t get tired.(A) drive by turns (B) were to drive by turns (C) should
• 4. ______________ your support, I would have failed.(A) If it were not for (B) Had it not been for (
• 5. It is necessary that natural resources ___________ conserved.(A) are (B) be (C) will be
• 6. I ___________ abroad last year but for my illness.(A) would go (B) had gone (C) would have gone
• 7. __________ from the earth, the galaxy in the far-away heavens looks like awhirlpool.(A) To observ
• 8. Of all the mammals in the world, ____________ eucalyptus leaves.(A) the exclusive food of the koa
• 9. The extinction of dinosaurs 65 million years ago can be explained by__________ the impact theory.
• 10. ________ some animals can predict impending earthquakes still mystifiesbiologists.(A) How (B) No
• 11. ________nearly every part of the tiger has certain ‘mysterious’ curative effectsis a deeply root
• 12. ___________ its olfactory functions, the elephant’s trunk also serves asanother “limb” to bring
• 13. Many parts of Australia are not fit for life __________ lack of water.(A) because it (B) is beca
• 14. The elephant can bring food to its mouth and even carry heavy objects________ its trunk.(A) beca
• 15. __________other reptiles, the lizard lacks a constant body temperature.(A) Unlike (B) Likelessly
• 16. An analgesic is any drug that relieves pain ________ causing unconsciousness.(A) no (B) without
• 17. The ant, ________ the bee, is a social animal.(A) is like (B) likely (C) like
• 18. Some mammals are so tiny ________ only a few inches in length.(A) that measure (B) they measure
• 19. Gorillas, though heavily built and extremely ferocious, usually do not attackhumans unless _____
• 20. Owls live mainly on small rodents and can be found __________ other speciesof birds can survive.
• 21. _________ is active during the night, it likes to spend the day in hollow treesand to nest there
• 22. Biologists believe ___________ may help some reptiles to escape from theirenemies.(A) that losin
• 23. ________ the symptoms of AIDS do not appear at the time of its contraction.(A) Usually (B) Usual
• 24. ________ that forty percent of the oxygen of the world is produced in theAmazon rainforest.(A) I
• 25. ________ of oxygen and hydrogen, which are two of the trace elements in air.(A) Water being comp
• 26. ________ us the ability to resist disease, but also helps us build our bodytissues.(A) Not only