________ to sunlight for too much time will do harm to one’s skin.
| A．Exposed | B．Having exposed |
| C．Being exposed | D．After being exposed |
It was only when I reread his poems recently________I began to appreciate their beauty.
| A．until | B．that |
| C．then | D．so |
I got an email from my old friend last Sunday.Until then，we________in touch for nearly 3 years.
| A．didn’t get | B．haven’t got |
| C．hadn’t got | D．don’t get |
Many people believe that hunger is only a problem in the developing countries.________，it is a problem all over the world.
| A．For one thing | B．In addition |
| C．As well | D．On the contrary |
Born into a family with three brothers，David was________to value the sense of sharing.
| A．brought up | B．turned down |
| C．looked after | D．held back |
We had just covered half the journey________the engine failed and we could do nothing but wait for help.
| A．before | B．since |
| C．when | D．until |