问题描述：
用适当的介词填空:They went to school by bus instead ___ on foot.
My sister is interested ___ music.
Sally tries to give ___ smoking.
Please finish it ___ once.
I receive a letter ___ my sister.
Let's go to the zoo,___?
My sister is interested ___ music.
Sally tries to give ___ smoking.
Please finish it ___ once.
I receive a letter ___ my sister.
Let's go to the zoo,___?
问题解答：
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