题目内容

__________ you understand this rule, you'll have no further difficulty.

A. Once
B. Although
C. While
D. As

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I shall __________ you by telephone on Friday.

A. contact
B. connect
C. complain
D. communicate

It was __________ opportunity to miss.

A. too good an
B. a too good
C. good too an
D. too good a

A little __________ is a dangerous thing.

A. knowing
B. study
C. learning
D. information

Teachers are not supposed to have __________, but they always do.

A. shortcomings
B. odds
C. favorites
D. heroism