题目内容：

完成句子(共3小题, 每题3分, 满分9分)

根据相关要求准确补充完整以下句子；完全正确方可得分。

1. Rather than take a bus to go downtown, they preferred to go there on foot. (同义句转换)

ð They ________ __________ go downtown on foot ________ take a bus.

2.Although he did his utmost, he failed, which made him so upset about himself that he felt like crying. (同义句转换)

ð ____ ____ ____ all his efforts he failed, which made him so depressed that he felt like crying.

3. The librarian put the ______ (换回来的) books ______ _______ (放回原处).