选择正确的介词填空。
1. We can search ________ (in/for) many things.
2. I often listen to music ________ (on/ at) the computer.
3. I like to travel_______ (in/ on) the world.
4. We have a lot ______ (to/ of) friends.
5. He often goes shopping ______ (in/ on) Sunday.
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