单项选择题

A. Asking the way.
B. Buying a ticket.
C. Checking in at the airport.
D. Booking a room.
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填空题
His suggestions turned out to be very (effect)______ in the improvement of our production.
单项选择题
If you ______ smoking and drinking, your health will improve soon.
A. gave up
B. give up
C. had given up
D. will give up
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