用括號(hào)中的介詞填空。
(on, like, after, at, in, of, under)
1. Is Li Lei ______ duty today?
2. My bike isn't ______ the tree. It's in the house.
3. What are these ______ English?
4. -Where is the broom?
    -I think it's ______ the floor.
5. -What's on the wall?
    -It's a map ______ China.
1. on   2. under   3. in   4. on   5. of
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