We drove to the airport to meet an expert from Germany, about 50 years old, his hair ________.
| A．was completely grey | B．be completely grey |
| C．to be completely grey | D．completely grey |
Science and technology have __________ in important ways to the improvement of agricutural production.
| A．attached | B．assisted | C．contributed | D．witnessed |
It _________ you to at least 50% off the regular price of either frames or lenses when you buy both.
| A．presents | B．entitles | C．credits | D．tips |
I hate people who __________ the end of a film that you haven’t seen before.
| A．reveal | B．rewrite | C．revise | D．reverse |
I had just posted the letter when I remembered that I hadn’t _________ the cheque.
| A．imposed | B．involved | C．enclosed | D．contained |
The opening between the rocks was very narrow, but the boys managed to _______ through.
| A．press | B．squeeze | C．stretch | D．leap |