Nowadays scientists are working hard to find out ______ to do with air pollution.

There are sixty minutes in ____hour.

It is ______ any wonder that hisfriend doesn’t like watching television much

(2013·安徽省名校联盟模拟)West of the city　　　, which provides a lot of job opportunities for the local people.

xt day, the group of villagers had not gone veryfarthey entered a verynarrow passage betweentwo mountains