Passengers are required to arrive to the gate fifteen minutes before departure time.

If today is Sunday, we would have a lot of fun at the camping site.

Although most species of small birds gather in groups at feeders provided by bird-watchers, the bright red cardinals usually appears alone or with its mate.

Students suppose to read all the questions carefully and find out the answers to them.

The Great Pyramid of Giza is said to have built over a 20-year period.

When you are writing or speaking English it is important to use language that includes both men and women equally the same.

The US, that is one of the most powerful countries, decided to declare a war to Iraq.

Having finished his tem paper before the deadline, it was delivered to professor before the class.

The world is becoming more industrialized and the number of animal species that have become extinct have increased.

When a patient's blood pressure is much higher than it should be, a doctor usually insists that he will not smoke.

Oxygen plays a important role in maintaining live.

One of the best ways to encourage your children to read are to provide interesting titles for them to enjoy.

Chemical engineering is based in the principles of physics, chemistry, and mathematics.

Neither the Minister nor his colleagues has given an explanation for the chaos in the financial market last week.

Tom said that he was trying to carry out some campaigns to protect environment and will encourage others to do so.

If one type of manufacturing expands, it is like that another type will shrink considerably.

Hardly did he enter the room when all the lights went out.

When many of my friends take a shower in the morning, I usually take one before bed.

Mercury and alcohol are widely used in thermometers because their volume increases uniform with temperature.

I enjoy reading the article that you told me about it yesterday.

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