As population increases, （ ）.

We mention the importance of giving up smoking once and again, but hardly ______ it.

I cannot tell the_____difference between the twins.

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

John Smith, a diligent student, never refuses to （ ） more responsibilities that are assigned to him.

If I had remembered （ ） the window, the thief would not have got in.

Most Chinese like tea, but some prefer coffee _____tea.

Before using your new pressure cooker, read the following （ ） carefully.

By the end of this term, we （ ） 3000 English words in all.

When I saw the expression on his face, I realized he is （ ） agreement with me.

It was not known （ ） he had said during the interview.

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