Many air flights _________because of the eruption of the volcano, in _______case, many passengers had no choice but to take a train.
_____ all the inventions have in common is ______ they have succeeded.
-We want someone to design the new art museum for us. -_____ the young fellow have a try?
- When he was a little boy,he ______ on the farm.
I’ll give the prize to _______ finishes the work first.
In the 16-19 age group,32 of women smoke ______ 28 of men.