选词填空。
1．I am writing an email ___________ (to; at)my friend.
2．They are having ___________ (the; a)great time.
3．Look, it’s an email ___________ (to; for) for us.
4．I sleep ___________ (in; at) a sock.
5．Let’s go to the restaurant ___________ (to; for)have lunch.
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