It is very difficult for human beings fighting pollution.

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

Developing new technologies are time-consuming and expensive.

Neither of the men arresting as terrorists would reveal information about his group.

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

Since January this year, Joe has suffered two injuries, one to his ankle and the other in New York.

Each of the nurses report to the operating room when his or her name is called.

Those who had already purchased tickets were instructed to go to gate first immediately.

When mining for gold, you must first obtain the gold ore and then apart the gold from the ore.

Mother’s Day is the day when children show their love on their mother on.

The Games' organizers faced significant bed shortages because the record number of more than 13,000 athletes and officials who attended the 2006 Games

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

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

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

The sates school system in England can be divided into two levels of educated: primary and secondary

Ralph wishes that he went to the bank this morning before he went to work.

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

Manufacturers may use food additives for preserving, to color, or to flavor, or to fortify foods.

English, together with Literature and Maths, are compulsory subjects in the national curriculum.

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

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