In many countries more and more forests and even agricultural land are being lost to development, _______ much of the land to become desert.
| A．caused | B．causing | C．having caused | D．to cause |
The lazy boy is indeed unusual: he knows nothing, ______ does he seek to know.
| A．so | B．either | C．nor | D．or |
If you ______ firm action to deal with it at once, you wouldn’t suffer heavy losses tomorrow.
| A．take | B．took | C．has taken | D．had taken |
---Don’t you think that funny Johnson is really ______ failure?
---But ______ book he wrote is very popular with teenagers.
| A．/, a | B．the, the | C．an, the | D．a, the |
I’m really sorry, Lucy. I ______ to help you, but I was too busy at that time.
| A．meant | B．mean | C．had meant | D．have meant |
Don’t worry. It won’t be long ______we see each other again.
| A．before | B．since | C．until | D．as |