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1. While all birds are alike in that they have feathers and lay eggs, ___great differences among them in terms of size, structure, and color.
a. to be
b. but are
c. if there are
d. there are
2. Not only___places of beauty, they serve scientific and educational purposes as well.
a. are botanical gardens
b. botanical gardens to be
c. botanical gardens are
d. to be botanical gardens
3. ___are a form of carbon has been known since the late eighteenth century.
a. Diamonds
b. because diamonds
c. diamonds, which
d. that diamonds
4. Designed by Frederic Auguste Bartholde,___.
a. the United States was given the Statue of Liberty by the people of France
b. The people of France gave the Statue of Liberty to the United States.
c. the Statue of Liberty was given to the United States by the people of France.
d. the Franch people presented the United States with a gift, the Statue of liberty.
5. If you want to catch the last train, it's time you (leave).
a. had left
b. left
c. are leaving
d. should leave
6. We can't consider (buy) a new house before (sell) the old one.
a. buying-selling
b. to buy-selling
c. buying-having sold
d. Both A and B are correct
botanical gardens are => are botanical gardens
B-> are botanical gardens