As population increases, （ ）.

Such problems （ ） air pollution and traffic jams are becoming more and more serious in some big cities.

Only those who have tasted bitterness will （ ） among others.

_____, the professor is still trying to learn a new language.

Air pollution is obviously one of the major _____ of city life.

—Do you like the material? —Yes, it （ ） very soft.

() comes back first is supposed to win the prize.

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

He studies so hard to avoid （ ） at the bottom of the class.

The defense computers calculate way to （ ） the enemy missiles.

“（ ） everyone’s here,” she said, “let’s begin to discuss the solution to the problems we have found．”

（ ） student with a little common sense should be able to answer the question.