They return their books to the libraryon time.
题目
They return their books to the libraryon time.
此句可改为：
They _ back their books _ the library on time.
答案
they give back their book to the library on time.
举一反三
已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
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