Then people learned how ........……telegraph messages

Gunpowder, in some ways the most effective of all explosive materials, were mixture of potassium nitrate, charcoal, and sulfur.

Southern California, is known for its mild winters, has become the new home for senior citizens escaping hard Northern winters.

Because of its vast tracts of virtually northern forest, Canada has one of the lowest population density in the world.

This is Dr. Ash calling. If anyone asks for me while I am away from the hospital, ask them to call back after four afternoon.

Fee Nitrogen is chemically inert and combines with other elements only since very high temperature or pressures

Choose the correct verb form:

Although we didn’t win, we were able to take some _____ from our performance.

Now that they have successfully passed TOEFL, the students were ready to begin classes at the University.

The patient who was not supposed to be released until the end of the week was told to dress in clothes and report to the nurses’ station.

In the 1920’s, cinema became an important art form and one of ten largest industry the United States.

Some heating devices chemist energy like that found in wood and coal into heat energy.

Hailey’s comet was named after the astronomer Edmund Hailey, who was the first realize that some comets appear in regular cycle.

He’s so brilliant and he can do anything - ……….

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

Some snakes have hollow teeth are called fangs that they use to poison their victims.

Some methods to prevent erosion are plowing parallel with the slopes of hills, to plant trees on unproductive land, and rotating crops.

Monkeys use their foot eat food, to gesture, and to climb.

Choose the best option:

She’s the woman ................ sister looks after the baby for us.

When a pearl is cut in half and examined under microscope, but its layers can be seen.

Many of the population in rural areas is composed of manual workers

Many houses and huts were washed away when the river bursted its banks.