Such animals as dinosaurs died out because they couldn’t ____ to the sudden change of the climate.
| A．suit | B．keep | C．adapt | D．switch |
He is afraid to face the difficulty he thinks he’ll have the driving test tomorrow; he finds it difficult rid of the worries．
| A．passed；got | B．passing；to get |
| C．to pass；getting | D．in passing；in getting |
After the long journey, the Smiths returned home, ____.
| A．safe but tired | B．safely but tired |
| C．safe and tiring | D．safely and tiring |
Not everyone has realized what_______ important part the balance of________ nature plays in their life.
| A．an；the | B．/；the | C．an；/ | D．the；/ |
It’s easier to catch a _____ lion than the one that’s awake.
| A．sleep | B．slept | C．sleeping | D．to sleep |
Mr. Smith didn’t go to the party because he had a lot of experiments _____.
| A．do | B．did | C．done | D．to do |