For thousands of years man dreamed 　（） seemed impossible dreams about flying.

The young man struggled to _______ where he was at the time the murder took place.

Its bad ____ for a man to smoke in the public places where smoking is not allowed.

The poor man works days and nights in order to gain more money.

When he was asked about the missing briefcase, the man _____ever seeing it.

It was the training that he had as a young man ____made him such a good engineer.

The young man struggled to _______ where he was at the time the murder took place.

He looked around and caught a man ____ his hand into the pocket of a passenger.

Man is superior to animals ______ he uses language to convey his thoughts.

阅读理解：阅读下列短文，回答文后问题，选择最佳答案Trees mainly serve man in three important ways: They provide him with wood and other products; they provide him shade; and they help to prevent droughts and floods.Unfortunately, in many parts of the world, man has not realized that the third of these services is the most important．In his eagerness to make money from trees, he has cut them down in large numbers, only to find that without them he has lost the best friends he had. And besides, he is usually too careless to plant and look after new trees. So the forests slowly disappear.This does not only mean that man will have fewer trees. The results are even more serious: for where there are trees, their roots break up soil allowing the rain to sink in and also bind(固定) the soil, thus preventing it from being washed away easily；but where there are no trees, the rain falls on hard ground and flows away, causing floods and carrying away the rich top-soil. When the top-soil is gone, nothing remains but worthless desert.Two thousand years ago，a rich and powerful country cut down its trees to build warships, with which to gain itself an empire．It set up the empire, but, without its trees, its soil became poor and grew weak. When the empire fell to pieces, the home country found itself faced by floods and starvation(饥荒)．2. In many places forests slowly disappear because __________.