The old man lived alone all his life and he _____________a rainy winter evening.

Father’s just come back from work,__________—_________. He is having a rest in the room now.

We are lucky to be among thegeneration of people who have ________ and experienced the great social changesin our country.

A model or an experiment in a science class can help us see thingswhich would_______ remain hidden.

What is the shirt made _____ –Silk(丝绸). It’s made _________ Shanghai.