Cindy and Tom like singing and dancing, but _____ students in the class go in for sports.
It isn’t so much whether he works hard; the question is whether he works _____.
___ by the beauty of nature, the girl from London decided to spend another two days on the farm.
The last time I _______ Jack, he _______ football with classmates.
—Did you have trouble with your car this morning?— Yes, but I finally managed _______.
—Growing population resulted in growing rubbish.—There is ______that rubbish will become the major threat to human beings in future.