题目内容：

根据句意和汉语提示，在空白处填入一个适当的单词。

1.—Dad, must we wait until the light becomes green?

—Yes, I’m afraid we have to. That’s the             （交通）rule.

2. The TV program Super Brain is so             （极好的，美妙的）that it is well worth watching．

3.As times goes, my grandmother can’t see as             (清楚) as she used to.

4. I              (骑) a bicycle to school, but now I am used to walking to keep fit.

5. It is said that             （大量）of tourists went travelling this May Day holiday.