Some of my friends are good at English while other are good at Mathematics.

Developing new technologies are time-consuming and expensive.

When a lion gets hungry, its manner changes and it becomes threatened.

Regarding as one of the leading figures in the development of the short story, O Henry is the author of many well- known American novels.

There are many reasons why a particular species may become endangering.

The director, as well as his wife and two children, were injured in the accident.

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

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

The US, that is one of the most powerful countries, decided to declare a war to Iraq.

Proteins are made up of folded irregularly chains, the links of which are amino acids.

English is speaking in many countries in the world.

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

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

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

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

The Oxford English Dictionary is well known for including many different meanings of words and to give real examples.

Could you tell me how can I get to the city library, please?

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

Reading several books on that subject, Bill considered himself an expert.

The two children tried as hardly as they could to bring about a reconciliation between their parents.

The bones of the elderly are more prone to fractures than of young people.