The problem ______ many children,especially girls,have ______ school is getting more and more serious.

It’s __________ for him to complete the project in one day.

Mark was afraid of being scolded，so he________say what he thought to his parents

24 — How did you go to work yesterday— I went to work _____ my friend’s privatecar

128. Their voices __________ to a whisperand I didn’t know what they were talking about.