This machine is very easy.Anybody can learn to use it in a few minutes.

Her car broke down on her way to the park.________, she had to ask someone to repair it.[ ]

I do not mind her criticizing me, but _____ is how she does it that I object to.

Is that girl in red Sally—No, it_______ be her. She has gone to Hong Kong.

The question that puzzled them is ____ they can get rid of the air pollution in the area.