niversity estimates that living expenses for international students ________ around $8，450 a year, which ________ a burden for some of them.

The hazy weather has ________ for almost a week in North China. —Yes, and the government has tried to solve it.

What does the sign over there read?—”No person_______ smoke or carry a lighted cigarette, cigar or pipe in this area．”

What’s happened to my library books— ____

The roommates have lived for three years and not once _____with each other.