下面都是元音字母的一组是________.
—What the number of the students in your class ? —About 60 . A number of them girls .
Why not ____ your teacher for help when you can't finish _____ the story by yourself?
—What him last night? —He had an accident on the way home.
—Can I help you?—Thanks. But I think the box is ______ heavy for you ______ carry.
Each man will be paid ______ his ability