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.

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

The developing of the submarine was hindered by the lack of a power source that could propel an underwater vessel.

Optimists believe that in future we will be living in a cleaner environment, breathing fresher air and eat healthier food.

He said that he has done his homework since 7 o'clock.

Mrs. Stevens, along with her cousins from New Mexico, are planning to attend the festivities.

Not everyone realizes that the most largest organ of the human body is the skin.

I was very busy lately since the project of designing the new collection started.

I’m not used to go to school late. I prefer punctuation.

Did you say that you will have a lot of things to do the following week?

What we know about certain diseases are still not sufficient to prevent them from spreading easily among the population.

In spite of my father is old , he gets up early and does morning exercise.

These snakes will not cause you any serious harm. They are harmful.

Had it not been for you help me, I wouldn't have succeeded.

The grass needs cutting, so let us have one of the men to take lawn-mower and do it.

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

Has the government made a decide to ban the use of chemical weapon yet?

Little he knows about the surprise that awaited him.

Thanks for the liberation of women, women can now take part in social activities.

Although most species of small birds gather in groups at feeders provided by bird-watchers, the bright red cardinals usually appears alone or with its mate.

The governor, with his wife and children, are at home watching the election results on TV.