（a不为0）的分数单位是 ，它含有 个这样的单位，当a是 时，它的分数的值为最小的质数．
This restaurant has the （good）service of three．
We should take action to protect animals in （dangerous）．
Jim has never been （be） to Mount Tai in China．
Tom and Jerry have a lot in common． Their （they） favorite basketball player is James Hardern．
Would you mind giving me some advice （advice） on how to plant trees？
（a不为0）的分数单位是 ，它含有 个这样的单位，当a是 时，它的分数的值为最小的质数．
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