Look at the terrible situation I am in!If only I ______ your advice.
___houses were knocked down in the earthquake
___in the regulation that you should not tell other people the password of your e-mail account
Most people would agree that nuclear science should be developed to benefit the human beings___harm them
Nowadays,rather than___letters,many people prefer to telephone.
We thought there were 35 students in the dining hall,___,in fact,there was 40