It is important that you turned off the heater every morning before you leave for class.

Most of the houses on the street was built in the previous century.

She did not know where most of the people in the conference was from.

Many young people lack skills, good education, and financial to settle in the urban areas where many jobs are found.

Oxygen plays a important role in maintaining live.

Both Mr. and Mrs. Smith are explaining the children the rules of the game. 

A child of noble birth, his name was famous among the children in that school.

There are many reasons why a particular species may become endangering.

There are some people in the government try to improve the lives of poor people.

Publishing in the UK, the book has won a number of awards in recent regional book fairs.

I had my motorbike repair yesterday but now it still doesn’t work.

The director, as well as his wife and two children, were injured in the accident.

Gettysburg has been preserve as a national historic monument because it was the site of a major Civil War battle in which many lives were lost.

My father asked me where had I gone the night before.

David, who mother is Vietnamese, speaks both Vietnamese and English fluently.

If I had studied carefully, I wouldn't made so many mistakes.