It was until dark ___ he found ___ he thought was the correct way to solve the problem.
| A．that; what | B．that; that | C．when; what | D．when; that |
— Smoking is bad for your health.
— Yes, I know. But I simply can’t ____________ .
| A．give it up | B．give it in |
| C．give it out | D．give it away |
It was only when I reread his poems (诗) recently _____ I began to appreciate their beauty.
| A．until | B．that | C．then | D．so |
I ______ her to work hard at English, but she didn’t listen to me.
| A．advised | B．tried to persuade |
| C．hoped | D．suggested |
—How long ____ you ____ in Singapore?
—For just the weekend． I’ll be back next Monday morning．
| A．have; stayed | B．are; staying | C．did; stay | D．do; stay |
Every possible means ___ to prevent the air pollution, but the sky is still not clear．
| A．is used | B．are used | C．has been used | D．have been used |