Taiyuan, a city in North China, was struck by a heavy snowfall last week, ____ serious traffic problems. [ ]

-How far apart do Tom and Jack live?—–______I know, they live in the same neighborhood.

It’s difficult for the villagers to cross the riverfor market.—I think a bridge _________ over the river.

___________________, the experiment will be successful.

It was Li Ming ___________ saved the boy.