根据汉语提示补全句子。 1. Is surfing the Net __________________(对健康有好处)? 2. You __________________(不应该吃太多的快餐). 3. __________________(打排球) is my favourite sport. 4. If you __________________(感冒), you should see a doctor. 5. Don’t __________________(和他生气), Mr.Li.