By the mid-nineteenth century, land was such expensive in large cities that architects began to conserve space by designing skyscrapers.

Little have people done to alleviate the sea pollution caused by the factories in central Vietnam, haven’t they?

It is important that cancer is diagnosed and treated as early as possible in order to assure a successful cure.

Would you mind showing me how working the lift?

His health gets good and better because he does gymnastics regularly.

My elder sisters, both of them were doctors, said they were too busy to pick me up.

In most countries music songs are deeply personal and deal with themes of love, lonely, and separation.

Generally, Europe and Asia are regarded as being distinct continents, but they are simply vast geography divisions of the larger lad mass known as Eurasia.

Looking from afar, the village resembles a small green spot dotted with tiny fireballs.

Mary and her sister just bought two new winters coats at the clearance sale.

Developing new technologies are time-consuming and expensive.

The office manager insists that his staff use all of their vacation time, but he hardly never takes a vacation himself.

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

I clearly remember to tell you about this before.

Since January this year, Joe has suffered two injuries, one to his ankle and the other in New York.

Increasing involvement in agriculture by large corporations has resulted in what is known as agribusiness-that is, agriculture with business techniques, including heavy capitalization, specialization of production, and to control all stages of the operation.

Two weeks are plenty of time to finish the assignment.

If you work hard, you would be successful in anything you do.

The eastern bluebird is considered the most attractive bird native of North America by many bird-watchers.

There are much kinds of books in my school library,but readers cannot borrow them.

Many teachers have devoted their lives to teaching therefore teaching is not a well-paid job.