用所给的词的适当形式填空。
1. Because of the heavy rain, the river had risen by ten ____ by midnight. (foot)
2. Not all people know earthquakes are caused by the ____ of plates. (move)
3. Sometimes it is really difficult to predict a ____ disaster. (nature)
4. Almost all the buildings in the city were ____ destroyed in the earthquake. (complete)
5. — I'm sorry to have kept you ____ so long. (wait)
— I have been here just for a few minutes.