－Last nightsomeone broke into our house.－Oh, dear!Anything

Look, a group of students are playing theviolin there, ____their teacher as the conductor.

Can he work out the maths problem—-I think _____ hard for him to work it out.

Take care! If you lose _______on the swing, you may fall down and hurt yourself.

You should go to bed early, ____________you will feel tired in the morning.