The teacher told me that the earth _______ round

The university estimates that living expenses for international students________around $8,450 a year，which________a burden for some of them. (2013·湖南，33)

The cars give off a great deal of waste gas in the streets. — Yes. But I’m sure something will be done to ___ air pollution.

Jim was able tohis anger and a quarrel between the two boys was avoided.

I kept looking at the man wearing a pair of glasses, wondering ________.