Either you or one of your students ________ to attend the meeting that is due tomorrow.

The government has made laws to protect animals，so the number of the endangered animals ________ in recent years.

The trouble with such resources as coal, oil and gas ______ that they are not renewable.

She told us what she bought yesterday ________ a few apples and some clothing.

This is one of the happiest days ____ spent in my life.

The number of smokers in China ________increased in recent years, and a number of them _________ the youth.

I’ve spare ___ juice for you, and your half ____ in the refrigerator.

The mother, as well as her two daughters, ____ to the theatre with some friends this evening.

Every possible means ______ to prevent the air pollution, but the sky is still not clear. 

Nowadays, either 21^st Century or other English newspapers _____ increasingly popular among us students.