As far as I know, this maths problem is _______________ that one.
Some people would rather ride bikes as bike riding has _______ of the troubles of taking buses.
In America, if _______ friend has invited you to drop in at any time, it is _______ best to callbefore visiting to make sure it is convenient for him.
People in industrial countries take in _________as they actually need every day.
To meet the challenge, the young people preferred _______ heavier work to do in their spare time.
--- What has happened to Alice ? --- I don’t know. She__________her job.