The chemical factory was torn down （ ） protecting the environment.

We could see the stars （ ） well from the top of the mountain.

The patient’s progress was very encouraging as he could_____get out of bed without help.

It was only by a great effort of will and courage that he was able to （ ） himself together.

（ ） weather may be too hot to the tourists.

As population increases, （ ）.

At the 60th anniversary, the guests sitting in the front are those ______ graduates from the university.

We’re talking about the piano and the pianist （ ） were in the concert we attended last night.

In the swamp the army （ ） by mosquitoes.

To save energy, people have to （ ） their electricity consumption.

The two companies decided to （ ） on a project concerning animal cloning.

Many students thought about the third question for quite a while and had great difficulty answering it. Obviously， it was _____ all.