单项选择题

When you read books, you had better make marks（）you have questions.

A. where
B. in where
C. at which
D. which

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单项选择题
Each penny, dime, and quarter（）carefully by the bank teller.

A. are counting
B. is counting
C. are counted
D. is counted
单项选择题
Please write your name in the（）space at the top of the page.

A. empty
B. vacant
C. blank
D. hollow
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