题目

用所给单词的适当形式填空 1. I enjoyed          (live) in China. 2. Tom is               (hard-working) than Sam. 3. It’s not difficult for me         (answer) the problem. 4. He is good at           (study) math. 5. Do you know some             (different) between British English and American English. 6. They shop          (two) a week. 7. Some boys play football two or three         (time) a week. 8. Here         (be) the results of the students activity survey. 9. He never took part in the  �光在真空中的传播速度是________m/s。我们能从不同方向看到本身不发光的物体，是由于物体对光发生了________反射(选填“镜面”或“漫”)。