Bill is often late for class, which makes his teachers angrily.

Most bothersome flies belong to the family Sarcophagidae and are popular known as flesh flies because the larvae feed on flesh.

There are much kinds of books in my school library,but readers cannot borrow them.

Conservation is the safeguarding and preservation of nature resources.

Unlike many writings of her time, she was not preoccupied with morality.

I can’t go out tonight because I have too many work to do.

Sex's education is instituted to help the student understandthe process of maturation, to eliminate anxieties related to development, to learn values, and to prevent disease.

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

Increasing involvement in agriculture by large corporations has resulted in what is known as agribusiness-that is, agriculture with business techniques, including heavy capitalization, specialization of production, and to control all stages of the operation.

Teddy Roosevelt demonstrated his competitive spirit and tireless energy in 1905 whenever he led the Rough Riders up San Juan Hill.

A smile can be observed, described, and reliably identify, it can also be elicited and manipulated under experimental conditions.

The Great Pyramid of Giza is said to have built over a 20-year period.

Today the number of people enjoying winter sports are almost double that of twenty years ago.

Working provide people with personal satisfaction as well as money.

I was amazed that Smith showed so few grief at his mother’s death.

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

If they took their language lesson seriously, they would be able to communicate with the locals now.

He has a great deal of books most of which are on science and technology.

Mercury and alcohol are widely used in thermometers because their volume increases uniform with temperature.

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

The company did not want to hire a man that his experiment was so limited.