He kept quiet ______

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.

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

At last she realized ______

______! The street is wet and slippery.

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

She had to have the operation ______.

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

Someone ______ the cake before I ______

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

The apples ______ all summer and now they ______ They look delicious.

She keeps ______ in the refrigerator.