Sulphur dioxide is a ______ that is released into the atmosphere by coal-fired power stations.

They caught a taxi ______ they could arrive at the conference on time.

Error Identification

Some people are concerned that burning garbage may make harm to the environment.

At the time being, many products are nearly identical ______ one another ______ quality and price.

Four years ______ a long time to spend away from your friends and family.

Without our ______, they would not have got accomplishment.

At last she realized ______

By ______, we often go to pagoda on New Year’s Day.

______! The street is wet and slippery.

She had to have the operation ______.

Her little boy is so imaginative. He can ______ stores himself.

The richest, 5 percent of Americans, earned approximately 10 times much as the poorest,20 percent.

Someone ______ the cake before I ______

______ I had brought my laptop to the meeting yesterday.

I want a new house. It ______ have a swimming pool, but it ______ have a nice garden.

She keeps ______ in the refrigerator.