ecame friends again that dayUntilthen,they_____to each other for nearly two years

Can he work out the maths problem—-I think _____ hard for him to work it out.

The best man will ________ and toastthe bride and groom at the banquet.

It was __________ computer games thatcost the young man a lot of precious time that he ought __________ on hislessons．

Unfortunately, when I dropped in, Doctor Li _____ for Beijing to join in the fight again SARS, so we only had time for a few words