“Tommy，run！Be quick！The house is on fire！” the mother shouted，with ________ clearly in her voice.                                                  (2011·湖北，21)

Although we haven’t got the accurate statistics, it is estimated that ______ 300 factories in this province closed down during the economic crisis.

 The scientist knew nothing about the matter, because he was always _________ himself in his study.

It seems impossible for the two neighboring countries to arrive at a ________ on the conflict in the near future.

—Can we go camping tomorrow，as planned?—I'm afraid not.The dark clouds ________a heavy rain.