A warning printed on a makeshift lifebuoy says: “This is not a life-saving device. Children should be accompany by their parents.”

Tenant farmers are those they either rent a farm and work it for themselves or work the farm for the owner and receive payment.

Because blood from different individuals may different in the type of antigen on the surface of the red cells and the type of antibody in the plasma, a dangerous reaction can occur between the donor and recipient in a blood transfusion.

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

Robots in the home might not be enough creative to do the cooking, plan the meal and so on.

In today's competitive markets, even small businesses had better to advertise on TV and radio in order to gain a share of the market.

Dinosaurs became extinct millions of years ago because of the earth's climate changed drastically.

It is believed that in the near future robots will be used to doing things such as cooking.

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

I can’t go out tonight because I have too many work to do.

Practicing his speaking English everyday, his hope was to get a good job in a foreign company.

For thousands of years, man has created sweet-smelling substances from wood, herbs and flowers and using them for perfumes or medicine.

In spite of my father is old , he gets up early and does morning exercise.

The amount of women earning Master's Degrees has risen sharply in recent years.

The number of students attending universities to study economics have increased steadily in the last few years.

There are some people in the government try to improve the lives of poor people.

Each of the beautiful cars in the shop was quickly sold to their owner.

He passed the exams with high scores, that made his parents happy.

Would you mind showing me how working the lift?

Mrs. Alien was concerned about me having to drive so far every day.

Paris is much more exciting as I expected.