One of most difficult questions in defining sleep is “What are functions of sleep?

Interestingly, the United States both produces or uses more crude oil than other nations.

Choose the best option:

John, ................ I met at the party, called me last night.

The most substances expand in volume when they are heated.

Industrialist Henry Ford introduced assembly-line techniques into manufactures of  vehicles.

Due to the forecast, the tunnel will be finished next year.

Commercial letters of credit are often used to financing export trade, but they can have uses.

In many areas of the world, people need clothing for protection  weather.

There is hostel at the bottom of the canyon where we can stay there

Choose the word or phrase among A, B, Cor D that best fits the blank space :
Meal times are generally set aside for periods of friendly get-togethers, and evenings often ……… the crew settling down to watch the latest DVD movies.

Society changes, but not change at the same rate or in the same direction.

Nancy said that she went to supermarket before coming home.

This will have a effect about agriculture

Either humans and animals learn by experience, and what is learned influences planning and carrying out of simple actions.

These engines used being started by hand. But now they are started electricity.

It _________Lan who always helps him in his trouble.

P.T. Barnum opened his own circus in 1875 and becomethe most famous showman of time 

I've just spent two weeks looking _____an aunt of mine who's been ill. 

He has less friends in his class now than he had last year

After George had returned to his house, he was reading book

You needn’t do that when the maid is here, _____?