把下面给出的英语单词翻译为汉语:return address
A. 回复地址
B. 返回
C. 地址
D. 地址不详
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Each worker puts in nearly 2,200 hours a year,_ _ _ _average,and contributes about $ 30 to GDP per hour.
A. with
B. in
C. on
D. under
If you have difficulty_ _ _ _your bills,tell you utility company as soon as possible.
A. pay
B. paid
C. to pay
D. paying
_ _ _ _most students own a smartphone,the school does not allow them to use it in the classroom.
A. Even though
B. In case
C. Now that
D. If only
The airport is usually your first stop before_ _ _ _on your vacation or trip.
A. leave
B. leaving
C. left
D. to leave