单项选择题

______ is often the case with a new idea, much preliminary activity and optimistic discussion produced no concrete proposals.

A．That
B．It
C．This
D．As
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单项选择题
Come and see me whenever
A．you are convenient
B．you will be convenient
C．it is convenient to you
D．it will be convenient to you
单项选择题
Clive, a student at Cambridge, will come home next week as university for the summer holidays on the 5th of July
A．breaks up
B．breaks in
C．breaks down
D．breaks off
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