用方框内所给单词的正确形式填空，每空一词，每词限用一次。

1. If I make a        , please don't laugh at me.

2. After his father's      a few years ago. Mike's life became much more difficult.

3. I        this CD, because it's boring.

4. First of all, it wasn't easy for me to make     sentences when I speak English.

5. He finds watching movies frustrating because the people speak too       .

6. Our chemistry teacher's classes are always       and interesting. We can't forget them easily.

7. It is     that it snowed heavily in New York last night.