________ a strange plant！I've never seen it before.(2011·辽宁，33)

A．Which  B．What  C．How  D．Whether

—Why does the lake smell terrible?

—Because large quantities of water ________.

A．have polluted  B．is being polluted

C．has been polluted  D．have been polluted

(2011·江苏)The fact that so many people still smoke in public places ________ that we may need a nationwide campaign to raise awareness of the risks of smoking.

A．suggest  B．suggests  C．suggested  D．suggesting

(2011·湖南)One－third of the country ________ covered with trees and the majority of the citizens ________ black people.

A．is；are  B．is；is  C．are；are  D．are；is

The basketball coach，as well as his team，________ interviewed shortly after the match for their outstanding performance.(2012·陕西)

A．were  B．was  C．is  D．are

All the scientific evidence ________ that increasing use of chemicals in farming ________ damaging our health.(2012·湖南)

A．show；are  B．shows；are

C．show；is  D．shows；is

Walmart，which is one of the largest American supermarket chains，________ some of its stores open 24 hours on Mondays through Saturdays.(2012·安徽)

A．keeps  B．keep  C．have kept  D．had kept

(2012·四川)—Goodbye，John.Come back again sometime.

—Sure，________.

A．I did  B．I do  C．I shall  D．I will

It's the first time that he has been to Australia，________？

A．isn't he  B．hasn't he  C．isn't it  D．hasn't it

You and I could hardly work together，________？

A．could you  B．couldnt' I

C．couldn't we  D．could we