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

Society uses such human emotions as proud, shame, guilt, and fear to maintain itself.

Regarding as one of the leading figures in the development of the short story, O Henry is the author of many well- known American novels.

Câu 5: The earth is the only planet with a large number of oxygen in its atmosphere.

Developing new technologies are time-consuming and expensive.

After the police had tried unsuccessfully to determine to who the car belonged, they towed it to the station.

Had it not been for you help me, I wouldn't have succeeded.