Every possible means _______to prevent the air pollution, but the sky is still not clear.
A. are being used B. have been used
C. has been used D. had been used
_____ the students in our class have in common is _____ they are all working hard to pursue their dreams.
A. What/ which B. What/ that C. That/ that D. That/ which
Big businesses enjoy certain _________ that smaller ones don’t have.
A .regulation B. privileges C. arrangements D.distributions
---Hello, Golden Bay Resort,Can I help you ?
--- Do you have a room _______ for this weekend?
A. available. B. useful C. possible D. empty
My MP4 has disappeared. Who _______ have taken it away?
A. could. B. should C. must D. might
The government has taken some measures to solve the shortage of electricity, but it may be some time ______ the situation improves.
A. since B. when C. before D. unless
