问题描述：
The_(cheer) little girl helps her friends a lot.
Einstein was a liow learner when he was a boy.He learnt things very_(slwow).
There are a lot new words in the (five)_unit.
Einstein was a liow learner when he was a boy.He learnt things very_(slwow).
There are a lot new words in the (five)_unit.
问题解答：
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