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.

We have been making prepare for our final exammination for two months.

The workers are building a new bridge which is 150 meters in high.

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

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

Sometimes it takes me about three hours finishing my round.

When she heard the news, she got so a shock that she dropped her glass.

Today's job seekers are confronted with such question as "Are you computer literate?" and "Can you set up a data base?"

My sister told me that she had met my teacher at the supermarket yesterday.

When you are writing or speaking English it is important to use language that includes both men and women equally the same.

Ours brains are incredibly agile machines, and it's hard to think of anything they do more efficient than recognize face.

When precipitation occurs, some of it evaporates, some runs off the surface it strikes, and some sinking into the ground.

Dogs that are trained to lead the blind must be loyalty, intelligent and calm.

It is important that cancer is diagnosed and treated as early as possible in order to assure a successful cure.

He passed the exams with high scores, that made his parents happy.

It is very difficult for human beings fighting pollution.

Abraham Lincoln was a good president and was self-educated, hard working and always told the truth.

Building thousands of years ago, the ancient palace is popular with modern tourists.

Doctors believe there is better in this modern world of ours to try to prevent illnesses than to rely on medicines to cure them.

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

English is speaking in many countries in the world.