—Would you like to come to dinner tonight？ —I’d like to, ___ I’m too busy.

— How long do you think it will be _______ the USA recovers from the losses of the financial crisis?— Perhaps four or five years.

_______ a small number of Australians are bitten by spiders each year, most recover without any medical treatment.

________difficulties we may come across, we’ll help one another to overcome them.

______environmental damage is done，it takes many years for the ecosystem to recover.