It is important that the boy （ ） an adult to take care of him.

（ ） his last word, he got into a taxi and disappeared in no time.

Not until I began to work did I realize how much time I （ ）.

Space vehicles were launched into outer space_____search of another living planet.

Education is not an end but a(n)_____to an end.

As far as the professor（ ） , college students should get into the habit of studying by themselves.

The Yellow Stone Park is a great tourist （ ） drawing millions of visitors every year.

（ ） he will come is doubtful.

You can only fly to London this evening （ ） you don’t mind changing planes in Paris.

My job as a research assistant is very specialized_____, which demands a lot of academic knowledge.

It’s too late to go out. _____， it’s going to rain.

Five hundred and fifty pounds （ ） too unreasonable a price for a second-hand car.