I’m afraid MrWood can’t see you until 4o’clock.—Oh, ____ I won’t wait.[ ]

John is very ________-if he promises to do something, he’ll do it.[ ]

I think that something has to be done to stop the air from being polluted, ______ ?

The matter _______people’s health surely requires ______ carefully.

It was _____ he came bank from Africa that wear _________ he met the girl he would like to marry.