单项选择题

Do you often look out of the windows while you ______ lessons

A. have
B. had
C. are having
D. has
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单项选择题
When taking a shower, please ______ that the shower curtain is inside the bath.
A. sure
B. ensure
C. insurance
D. ensue
单项选择题
Everybody including the White Brothers to have a holiday there.
A. wants
B. want
C. will want
D. do want
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