Thousands of Haitians cheered as the Chinese medical team arrived，many of ______even cried with joy.
| A．those | B．them | C．whom | D．who |
Do you know how long the dinosaurs _____ on the earth before their extinction?
| A．had existed | B．had been existed |
| C．have existed | D．have been existed |
Our class missed___ gold in the competition of volleyball, but will get ___ second chance in football..
| A．the; the | B．/; a | C．the; a | D．a; / |
________ the front door________, he had to enter the room through the back door.
| A．Seen; painting | B．Seeing; painting |
| C．Seeing; being painted | D．to see; being painted |
The government has considered________ many steps ________the environment free from pollution.
| A．to take; to protect |
| B．taking; to keep |
| C．to have taken; stopping |
| D．having taken; preventing |
You’d better focus all your attention on the class. ________ you’ll miss the most important points.
| A．If not | B．If so | C．If any | D．If ever |