Have you found out the exact reason why the dinosaur _________ many years ago?
| A．died down | B．died out | C．died from | D．died of |
Only those who follow their dreams ____ achieve the final success．
| A．do they | B．can they | C．they can | D．can |
We’d better take umbrellas—I’m sure it _____ when we arrive in London; it’s always wet there at this time of year．
| A．will rain | B．is raining | C．will be raining | D．would rain |
I ____ to go for a walk, but someone called and I couldn’t get away．
| A．was planning | B．planned | C．had planned | D．would plan |
___ help the people in the snowstorm in the south made him worried．
| A．Not known how to | B．Unknown what to do to |
| C．His knowing not how to | D．His not knowing how to |
Written in a hurry, ___________．How can it be satisfactory?
| A．they find many mistakes in the report | B．lots of mistakes have been made in the report |
| C．there are plenty of mistakes in the report | D．the report is full of mistakes |