Part 1 Warming Up, Pre-reading, Reading and Comprehending
I.根据本部分所学单词及提示写出所缺单词的正确形式。
1. The fertilizers used on many farms are p________ the water supply.
2. It is known that many types of cancer can now be c________.
3. If we f________ something, we expect and believe that it will happen.
