He likes to help others ________ he is very busy.

The number of people invited to the party _____ sixty, but a number of them ______absent.

         catch the first bus, he got up very early this morning.

Keep ______. The camera is ready.

 Actions __________ walking and drinking are quite difficult in the moon.

Your time should be made full use of ________ English well.

While ___ along the street, I met an old friend of mine.

There was ______ time _____ Chinese used foreign oil.

It is the first time that I _______ this kind of moon cake.

It was because of the bad weather __________ the football match had to be put off.(推迟)