用适当的介词填空
I often watch TV          Saturday evenings.
In highrises people go up and down         a lift.
Most students go home          school. But some stay_________ school.
____________February there are only 28 or 29 days. It has the fewest days ______the twelve months
It is a long way_____________ China and the U.S.
Whales can stay______________ the water_____________ a long time. They come up only_____________ air and their noses are____________ the top of their heads.