All the traveling _____ are to be paid by the company if you travel on business.

In the experiment we kept a watchful eye （ ） the developments and recorded every detail.

In the swamp the army （ ） by mosquitoes.

We arranged to meet at the station but she did not （ ）.

Frankfurt, Germany, is one of the most （ ） populated regions in Western Europe.

_____ the members cooperate well, the team will keep winning games.

The audience stood and （ ） at the end of the performance.

—Shall we invite Tim? —No, it’s too late to invite any more people. _____, he hates parties, you know.

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

Many young people find it harder to appreciate_____music than pop music.

Without your instruction, I （ ） such great progress.

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