It is （ ） impossible to work with this noise around.

By the time the course schedule is completed， we _____ the basic subjects of French.

The chemical factory was pulled down _____protecting the environment.

If you get into difficulties, don’t hesitate to （ ） help.

—（ ）, Madam. Is there a post office near here? —Keep on going ahead.Turn right at the first crossroad.Then you’ll find one there.

You should respect others’ opinions, and at the same time you should insist on （ ） you believe is right.

A news report is usually very short, （ ） when it is about something very important.

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

When and where to hold the meeting （ ） not decided yet.

If the wounded soldier had been given first_____, he would not have died.

When he really does something wrong, he is willing to （ ）.

We consider_____the instrument be adjusted each time it is use