Short-wave radios that can receive and transmit signals are used by pilots, the police, and amateur operator .

All the students are looking forward spending their free time relaxing in the sun this summer.

Because of it consists only of a relatively short strand of DNA protected by a shell of Protein, a virus cannot eat or reproduce by it self.

Located in Canada, the Columbia Ice field covers area of 120 square miles and is 3,30 feet thick in some places.

My brother shouldn't do that,  _    ?

The panda's ...... habitat is the bamboo forest.

If the lecture ____ so quickly, we’d have understood his speech.

The ...... friendly products are designed not to harm the natural environment.

Never before has so many people in the United States been interested in soccer.

Not everyone believes that ..................technology has improved .................. quality of people's lives. 

...........big books on ...........table are for my history class. 

Without any hesitation, he did a decision not to take the course

Geologists find it useful to identification fossils in a rock sample because certain assemblages of species are characteristic of specific geologic time periods

................. money you gave me is not enough to buy ..................bicycle. 

Dislike the gorilla, the male adult chimpanzee weighs under 200 pounds.

The number of student attending English courses at our university are increasing.

Margaret Gorman, she was the first woman chosen as Miss America, died in 1995 at the age of ninety

The surface conditions on Mars are the more similar with the Earth’s than those of nay other planet in the solar system

Every city in the United States has traffic problems because the amount of cars on American streets and highways is increasing every year

Choose the correct answer to complete the sentence. "Twenty per cent of all the birds in the world ______ in the rainforest"

According to many educators  television should not become a replacement for good teachers, and neither are computers.