Hurry up, Mum. The lights are turned on. Dad has been back.—It _________ be him. He has gone to Shanghai.

Now more and more children leave their parents when they grow up. It makes the old feel.

.—Tomorrow is Sunday. Are you going swimming? —I’m not sure. Itthe weather.

The old pen is broken, I’d like ______ one to write with.

I know the boy _____ the teacher.[ ]