The university estimates that living expenses for international students ________ around $8,450 a year. which ________ a burden for some of them.
It is strange that such a thing ______ in your school.
—What a pity! Their experiment is a failure. —They ________ better under more favorable conditions.
more energy to my study instead of being crazy about Internet games, I would be sitting in a comfortable office now.
Jack is a great talker. It's high time that he ________ something instead of just talking.
It is necessary that the government solutions for the problems of air pollution to create a clear environment.