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
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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
单项选择题
Have you ever spent a lot of time ______ for a perfect Christmas present
A. search
B. to search
C. searching
D. searched
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