It’s the second time that I _______ in Beijing. What great changes! It’s years since I ________ here last time.
Large quantities of cotton___shipped all over the world already.A large quantity of bamboo___used for pipes to carry water
___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.