用正确的介副词填空：The boy stumbled _____ something and hurt his leg.
用正确的介副词填空：
P20
5.The boy stumbled _____ something and hurt his leg.
7.They work _____ pairs to work out maths problems.
8.The doctor is not care enough _____ all.
P29 2.The teacher looked _____ the newspaper and found it.
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