The factory was fined for ...... chemicals into the river.

Every scientist knows that gravity is the force that maintains the earth and the planets in its orbits around the Sun

Choose the correct answer to complete the sentence.  "In the polluted environment, _______ diseases can be passed easily from one person to another"

In some species of fish, such the three-spined stickleback, the male, not the female, performs the task of caring for the young.

Without alphabetical order, dictionaries would be impossibility to use

Many scientists contributed to the development of television, whether no one can be said to have invented it.

Many birds will, in the normal course of their migrations, flying more than three thousand miles to reach their winter homes.

Migration of animals be initiated by physiological stimuli such as reproductive changes, external pressures such as weather changes, or a combination of either types of changes.

If the water level has raised a little higher, the dam would probably have broken

Lawrence Robert Klein received the 1980 Nobel Prize in economics for pioneering the useful of computers to forecast economic activity

I think he will come here, _    ?

The instructor advised the students for the procedures to follow in writing the term paper

Indiscriminately dumping of waste material and inadequate sewage treatment are two serious causes of environmental pollution.

Alike other forms of energy, natural gas may be used to heat homes, cook food, and even run automobiles

There is a local elected council which has responsibility for roads street lighting and other facilities

A computer networks usually includes either selected employees of a particular business or or people who do not work together but have similar interests.

Choose the correct answer to complete the sentence. "Centuries ago, man discovered that removing moisture from food helped _______ it."

Hardly he had got downstairs when the phone stopped ringing yesterday afternoon.

It is necessary that the director will sign all the copies, not just the top one

The government’s budget maybe considered balanced when the amount of money it spends does not exceed the amount it receives.

The campaign will hopefully ensure the survival ...... the tiger.