例题解析（March-21）Answer the question below the text by choosing

例题解析（March-21）
Answer the question below the text by choosing A,B,C,or D
Then tell us why you should choose this answer.
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1、This is the same book ______ I read years ago.
A.that B.which C.about what D.of which
2、It is necessary that an efficient student ______ his assignment on time.
A.complete B.completed C.can complete D.completes
3、The children watched the rocket ______.
A.launched B.be lauched C.to be lauched D.being lauched
4、My father is ______ respected by his colleagues.
A.very B.rather C.enough D.much
5、______ ——There is nothing to worry about!
A.Get down B.break down C.Calm down D.Keep down