A lot of language learning，________has been discovered，is happening in the first year of life，so parents should talk much to their children during that period. (2012·安徽，29)
| A．as | B．it |
| C．which | D．this |
________ 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 |
Suffering from war, hunger and illness, many African children are ________ food, love and care.
| A．in case of | B．in charge of |
| C．in face of | D．in need of |
There is a peaceful and calm ________ in the country, quite different from that of a big city.
| A．climate | B．atmosphere |
| C．system | D．situation |