你的同学到你家玩，你想把他或她介绍给你的母亲认识，你应该对你母亲说 ____________。

The picture book doesn’t seem so popular. What about the dictionary—Oh, the dictionary _______ well.

My cousin worked all winter vocation, saving money to______ his hobby of collecting stamps.

At present, lots of people would rather inthe country because there is pollutionin the city.

Listen! Someone is playing the piano.— Wow! __________ beautiful music! I like it very much.