By measuring the color of a star, astronomers can tell how hot is it.

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

The police is looking for the bank robbers who stole a large sum of money from the bank.

I enjoyed talking to the people with that I met at the party last night.

Slowly and with care, the museum director removed the Ming vase from the shelf and placed it on the display pedestal.

My elder sisters, both of them were doctors, said they were too busy to pick me up.

Because blood from different individuals may different in the type of antigen on the surface of the red cells and the type of antibody in the plasma, a dangerous reaction can occur between the donor and recipient in a blood transfusion.

My teacher is very strict and he always makes us to finish all the exercises before leaving school.

The harder he tried, the worst he danced before the large audience.

If you work hard, you would be successful in anything you do.

It is the recommendation of many psychologists that a learner ought to use mental images to associate word and remember them.

Having finished his tem paper before the deadline, it was delivered to professor before the class.

The chief of police demanded from his assistants an orderly investigation, a well-written report, and that they work hard.

Narcissus, a character in mythology, gazed at his own image in a pool so ardently that he fell into itself and downed.

There was a gradual raise in the number of literate males and females in the lowlands.

Passengers are required to arrive to the gate fifteen minutes before departure time.

Conservation is the safeguarding and preservation of nature resources.

A novel is a story long enough to fill a complete book, in that the characters and events are usually imaginary.

For thousands of years, man has created sweet-smelling substances from wood, herbs and flowers and using them for perfumes or medicine.

If today is Sunday, we would have a lot of fun at the camping site.

Of all the art-related reference and research library in North America, that of the Metropolitan Museum of Art in New York City is among the largest and most complete.