The amount of books in the Library of Congress is more than 58 million volumes

It is time the government helped the unemployment to find some jobs.

In winter it is important for farmers to provide food and warm for their animals

Interest in automatic data Processing has grown rapid since the first large calculators were introduced in 1950.

The first vaccine ever developed was used to combat and fight a smallpox, a disease resulting from infection by a virus.

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

Because of its vast tracts of virtually uninhabited northern forest, Canada has one of the lowest population density in the world

John and Mary went to........... school yesterday and then studied in ........... library before returning home. 

Short-wave radios that can receive and transmit signals are used by pilots, the police, and amateur operator .

Choose the correct answer to complete the sentence. " Carbon dioxide is one ---- the primary greenhouse gases that cause global warming."

Everyday in summer, but especially at the weekends, all kinds of vehicles bring crowds of people to enjoy the various attraction.

Choose the correct answer to complete the sentence. "In order to prevent darkening, pears, peaches and apricots are ________ to the fumes of burning sulphur before drying"

During his twelve year there, Ellsi Marsalis turned the New Orleans Center for the Creative Arts into a rich training place for future jazz stars.

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

Long prized for its medicine value, ginseng these days has become the most common of energy-boosting drinks particularly for high- performance athletes.

Our house has been redecorated last week. You can still smell paint when you enter and the wallpaper has a striking contrast with the floor.

David is talking to his friend, _    ?

Unexploded bombs buried deep in the ground have been found in the construction site opposite of the City Hall

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

The company suffered substantial losses after the stock market crash and found it difficult for recovering.

Lightning rods are used for to direct intense electrical bursts into the ground instead of into buildings and people