In spite modern medical technology, diseases caused by viruses are still not curable

Kiwi birds search the ground with the bills for insects, worms, and snails to eat

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

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

Sheep have been domesticated for over 5,00 years ago.

Everything is alright, ________?

Your computer can sometimes let you _____. 

Before the telephone was invented by Alexander Graham Bell in 1876, it was hard for people ........……over long distances.

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

The way a child plays with other children reveals a lot about the child’s emotional develop.

Many houses and huts were washed away when the river bursted its banks.

A great aviation pioneer, Amelia Earhart was already famous when she sets out on her ill-fated attempt to circle the globe 1937’s.

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

I haven’t decided yet about either to buy a car or second-hand one.

To raise successfully, farmers must selecting cattle for breeding and apply a dietary regimen

With its strong claws and many protruding tooth, a gopher is excellent digger.

“How does the human brain work?” remains one of the most profound questions confront modern Science

The coal is the world’ abundant fossil fuel .

After driving for twenty miles, he suddenly realized that he has been driving in wrong direction.

Migration of animals be initiated by physiological stimuli such as reproductive changes, external pressures such as weather changes, or combination of either types of change

The success of shared holidays depends on .................  you shared it with.