A mainframe computer is large and is usually used to operate network of other computers.

If you “make a “five-days” trip across the Atlantic Ocean, your ship “enters”  different time “zone” everyday

Choose the best option:

What do you often do ___ the first day of the year?

Genetic engineering is helping researchers unravel mysteries of previously incurable diseases so that they can get root causes and find cures

Exercising well is as important to your health like sleep and eating correctly .

The evolution fishes is a history of constant adaptation to new possibilities, and a refined these adaptations.

The early periods of aviation in the United States was marked exhibition flights made by individual fliers (or by teams of performers (at country fai.

Each chemical (element is characterized to the number of protons that an atom of that element contains, called its atomic number.

Needles are simple look tools, but they are very relatively difficult to make.

Believed that Jack had got home safely, we felt relieved

The signing of the peace treaty was an event major importance.

If it will rain this afternoon, we will have to cancel (our picnic.

In purchasing a winter coat , it is very important for trying it on with heavy clothing underneathed

Bronze, after being heated by a strong flame, will changing color, especially when exposure to hydrogen 

Some cteria are extremely harmful, but anothers are regularly used in producing cheeses, crackers, many other foods.

Visits to the zoo is delighting to any child

When she retires  in September 1989, tennis champion Christine Evert was most famous woman athlete the United States.

Algebra is the branch of mathematics concerned with operations on sets of numbers other elements that are often represented at symbols.

Either John or his wife ………breakfast each morning. 

Not one (one hundred children exposed to the disease are ikely to develop symptoms of it.

The pilot along with his passengers … rescued last night.