When a question ________at the meeting, no one could answer it.

________in a heavy traffic jam in a taxi while you are hurrying to the airport is quite an unpleasant experience．

       by a policeman, the children crossed the street safely.

The bridge _________2,000 meters long was designed by Frank.

The long-lasting war, ______ with blood and death, ended in people’s sadness, ______ no result.