We need to preserve the ____ of wildlife because each species has an important role to play. A. diversity B. various C. population D. type

I worked very hard for the exam. Then I passed it. (Before)

We admired the Japanese ____ the city of Fukushima after the disaster. A. to being rebuilt B. for having rebuilt C. to rebuild D. of having rebuilt

She wrote a letter. Then she went to bed. (After)

Vietnam has been named among the 12 countries most ____ for climate change by the World Bank. A. at danger B. in risk C. at risk D. ready

They have lived here for a long time. They know about it clearly.

. ____ trees around the house on the south and west sides, they can save up to about $250 a year on cooling and heating. A. Having planted B. Being planted C. To plant D. To have planted

We have done two tests today, so we are exhausted.

He was punished by the teacher. He was sad.

As he had drunk too much, he didn't drive home himself.

She filled the washing machine and switched it on.

Buying organic food is better for the environment because it uses less ____. A. fertilizer B. fertilize C. fertilizes D. fertilized