根据句意及汉语提示写出所缺的单词
1. I think it is _cruel_(残忍的) to kill the animals.
2. 2017·宿迁Most people in China couldn't  afford(买得起) carstwenty years ago.
3. Reading in the sun is harmful(有害的) to your eyes.
4. The government has made some aws (法律) to protect the wild animals.
5. About 70 million sharks are traded in this industry(行业)every year.