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The teacher is busy ____ teaching.

A.with                        B.for             C.on                 D.of

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We go to school ____ a bike.          

A.in                B.on              C.by             D.ove

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To understand the grammar of the sentence,you must break it______ into parts. 

A.down          B.up          C.off           D.out

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 2. “_____ when does the pub stay open?”  “About midnight.”

    A. Since. B. Before

    C. Until. D. After

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The trouble is ____ we can not find such an expert.

A. why                 B. that                  C. where                  D. /

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They were surprised that a child should work out the problem they themselves couldn’t.

A.once B.then C.while D.if

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 11. The chemistry teacher required the students _______ more attention _______ the lab clean.

A. to pay, to keep     B. to paying, to keeping  C. to pay, to keeping      D. paying, keeping

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We have produced 15% more cotton this year____ we did last year.

A. as                B. than           C. like            D. white

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Write clearly ____ your teacher can understand .you correctly.

A. since            B. for           C. because                      D. so that

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Some people say that we live _____ the age of computers.

A. in                    B. at                         C. with             D. for

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