It is reported that air pollution affects rivers and lakes indirectly because it causes acid rain.

We are lucky to have the most up-to-date equipment in our laboratory, with which we can complete our research in time.

All of our four objectives of this trip have been fulfilled, which is more than I had expected.

You may use this computer, on condition that you are able to handle it properly so as not to damage it.

No sooner had the decision been announced among the staff than Ali got his feet to protest.

It doesnt make much difference whether he can pass the exam or not.

These housing problems will be apparently diverse although every different city has similar population densities.

Wearing a seat belt saves lives; it decreases the chance of death or serious injury by more than half.

Mr. Smith demands that all reports be carefully written and above all be based on the facts.

Candidates should be given the company brochure to read while they are waiting for their interviews.

The manager tried to create a situation in which all people present would feel comfortable.

Obtaining enough food is the first concern for every nation; in some countries food shortages have become a serious problem.

The challenge we are facing in this century is to find new means of controlling energy.

Children who want to be treated like adults should act in a responsible and trustworthy manner.

As demands on the telecommunication system continued to increase, the limitation of current technology became apparent.