When you are doing reading exercises, it is a good idea to _________ the questions before you read the articles（文章）.

It __ be the vocyou the problem in the exercise because you know a lot of words.

Why not ______ about names

They’ve got two machines, but ________works well.

Listen! Someone is singing in the next room. Who ____ it be Is it Li Wei—No, it ______ be her. She is at school now.