![](https://cos-cdn.shuashuati.com/pipixue-wap/2020-1230-1107-53/ti_inject-812ce.png)
用单词的适当形式填空。 1. He didn't go to school because of his ______ (sick). 2. The old man is______ (serious) sick, he is much ______(sick) than yesterday. 3. He runs much _____ (fast) than his brother. He runs______ (fast)in his class. 4. Here ______(be) some of the results. 5. Do you think cars are ______(safe) than bikes?