1. A) Although B) But C) Since D) Because
2. A) uneven B) bumpy C) rough D) smooth
3. A) little B) much C) many D) few
4. A) terrible B) horrible C) tolerable D) enjoyable
5. A) to B) into C) at D) by
6. A) merge B) connect C) combine D) mix
7. A) busy B) small C) large D) heavy
8. A) when B) where C) which D) that
9. A) walk B) go C) take D) fix
10. A) more B) less C) very D) extremely
11. A) All of these B) None of these C) All roads D) Some of these
12. A) out of B) out C) through D) from
13. A) lying B) lie C) lies D) lay
14. A) direct B) indirect C) enjoyable D) beautiful
15. A) these B) which C) that D) where
Keys: ADCDD BDACB DCAAD
A Biological Clock
Every living thing has what scientists call a biological clock that controls behavior. The biological clock tells __1__ when to form flowers and when the flowers should open. It tells __2__ when to leave the protective cocoon and fly away, and it tells animals and human beings when to eat, sleep and wake.
Events outside the plant and animal __3__ the actions of some biological clocks. Scientists recently found, for example, that a tiny animal changes the color of its fur __4__ the number of hours of daylight. In the short __5__ of winter, its fur becomes white. The fur becomes gray brown in color in the longer hours of daylight in summer.
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