单项选择题

It is no easy job to be a teacher. One has to be extremely patient () the students.

A. at
B. about
C. on
D. with

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单项选择题
I took the glass very carefully lest it ().

A. should damage
B. would damage
C. had damaged
D. should be damaged
单项选择题
A solid is different from a liquid()the solid has its definite shape.

A. in that
B. in which
C. in what
D. because of which
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