Riding a bicycle can be fun. But _______ you ride a bike to work, and then there isn’t one to ride home?
My sister_______ the League last month and she has decided to _______ the activity to help the aged next week.
Life would be happier if we could only be born at the age of eighty and ________reach eighteen.
You’d better get the second-hand car ________ before you sell it.
They believe that there is _________ in the world.
---How about going for a walk after supper? -----__________.