We should consider the students’ request _____ the school library provide more books on popular science. [ ]

We ________ our lives had it not been for the policeman.

How many people will come to Beijing next year—It’s hard to say. ___________ people, I think.

Alice, you feed the bird today, _____—But I fed it yesterday.

. (2010·江西名校模拟) —I’ve heard they went skiing in the mountains last winter.—It ______ true because there was so little snow there then.