Better _____ all the lights are turned off before you leave the classroom．
| A．to be sure | B．to make sure | C．be sure | D．make sure |
They gave a(n)________broadcast while the performances were in process on the stage.
| A．lively | B．alive | C．living | D．live |
My father enjoys his spare time by reading newspapers or________to music.
| A．listening | B．listens | C．to listen | D．listen |
__________ you work harder than before, you will pass this exam.
| A．As soon as | B．As long as | C．As if | D．Even if |
____ H1N1 flu from spreading, our government has taken some effective measures.
| A．Prevent | B．Preventing | C．Prevented | D．To prevent |
With the price _______ so quickly, I find 1,000 yuan a month can hardly cover the cost of living.
| A．to rise | B．risen | C．being risen | D．rising |