Chicago’s Sears Tower, now the taller building in the world, rises 1,522 feet from the ground the top of its antenna.

Protecting Florida’s coral reefs is difficult because of the corals are very fragile even the touch of a driver’s hand can kill it .

Thee diameter of the Sun is more than one hundred times greater than Earth.

All nations may have to make fundamental changes in their economic, political, and technological institution if they preserve environment.

Jack London, whom was known for his stories of Alaska, lived there during Klondike gold rush.

Find mistakes and correct

It is becoming extremely difficult to grow enough to feed world’s rapidly increased population.

The threat of being dismissed do not worry any more because I have started my own business .

The boy who won the two medals ………. a friend of mine. 

If you need to keep fit, then why don’t you take on sports such as badminton or tennis?

The ancestors of some French Americans originally came to The United State because of French Revolution, that broke out in 1789.

He had so a difficult exercise that he couldn’t do it

Stand up straightly, breathe deeply hold your head up, and look down!

The graphics ability of a computer depend on the speed of  processor and the size of  RAM

He has made a lot of mistakes in his writing because his carelessness.

Where ……………. your family live? 

The number of student attending English courses at my university are increasing

In the architecture, a capital is the top portion of the columns.

She promised that she would come, but  she doesn’t .

Some of the land in region is so wet and hot and covered with jungle that few people live there.

Yogurt contains a higher percentage lactic acid than another fermented milks, and it is rich in B-complex vitamins.

Conservation organizations help for  to preserve the ecology of area by keeping track of dangered species.