1 . 用以下短语的正确形式填空。（有四个多余选项）

1. Being afraid of snakes, she always _____________ a scream when seeing one.
2. I would like to thank Mr Smith ________________ the school for his work as a scholar, an engineer and an educator.
3. In recent years, the winter temperature in this region tends to ___________, and one of the main reasons which have resulted in this increase is the air pollution.
4. ______________ the cold, he jumped into the river and pulled the fallen boy out of the water.
5. Many scientists believe that global warming has _______________ through the burning of fossil fuels.