用适当的介词填空。
1．Some animals sleep _______ winter.
2．I often play ________ my pet cat.
3．Look _________ my new watch.
4．Thank you ________ your present, Mum.
5．Look! The boy is coming out _________ the box.
6．There's an owl _______ the tree.
7．He's a good student. We should learn _______ him.
8．I read books ________ one hour every night.
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