Jim _______ ride to school. But now he _______ walking to school because he wants to keep fit.

I borrow your book, Mr. Smith— Sure, here you are.

Could you please give some ______ to the ______ teachers

(2009湖南娄底重点高中联考)It is the test system，the teachers，that is to blame for the heavy burden of middle school students nowadays。

It is believed that a new kind of drug ______ by the scientists and they are hopeful that they will succeed in a couple of months. [ ]