He studied hard at school when he was young, ______ contributed to his success in later life.
A. that
B. which
C. therefore
D. So that
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You shouldn’t get angry just _________ some people speak ill of you.
A. because
B. as
C. since
D. for
The faster anything is thrown into the sky, _________ it goes.
A. the more high
B. the more height
C. the higher
D. the high
By 2010, it is ____________ that computers will be able to perform at least 2 billionoperations per second.
A. adjust
B. projected
C. identified
D. organized
They stood in the rain for two hours, but they ____________ for Mr. Ying, because hedidn't come at all.
A. needn't have waited
B. can't have waited
C. mustn't have waited
D. may not have waited