The maths problem is so difficult that none of them can .

My father likes reading. There ________ many books on his desk.

Many children often have milk and bread _____ breakfast. [ ]

Can I tell Peter about the news?—No, I don’t want anyone else to know it. You _______keep it to yourself.

Why do you ____ the radio? I can’t hear the light music clearly.—I’m afraid of waking the baby up.