单选题Skating can be good for you ______ correctly.
单选题The reason ______ they died was lack of medical care. A. which B. at which C. in which D. why
单选题Do you know why John didn"t ______ at the party yesterday evening?
单选题Wood does not conduct electricity, ______.
单选题—What's going on? —______.
单选题She had a hard time ______ mathematics.
单选题She says she"d rather he ______ tomorrow instead of today.
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单选题Living things are ______ cells, and cells do not grow to more than twice the size they were at first.
单选题Scientific research indicates that two-thirds of the earth surface _____ with water.
单选题Nobody but Henry and Jack __________in the accident.
单选题The story of Lei Feng _____ millions of people to give help to those in need.
单选题"(Shall) I give you a cheque (for ＄ 10)?" "I'd rather you (give) me (＄10 in notes)."
单选题Some drivers always drive carelessly. There is some ______ danger while they are driving.
单选题They were (used to) (hear) him (singing) in a cheerful voice in the classroom when he thought (no one) was near.
单选题I ______ writing the article by the time you get back.
单选题Observations were made ______ the children at the beginning and at the end of pre-school and first grade.
单选题The clouds had spread and nearly ______ the entire sky.
单选题Neither Tom nor I ______ able to inform Anna to go to cinema on time.
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