Unit 10 You’re supposed to shake hands.SectionA (3a-4c)I. 单项选择：（BC 层学生必做，A 层选做或不做）( )1. To keep safe, everyone _________to wear a seat belt in the car.A. is supposed B. supposedC. are supposedD. will suppose( )2. ---Henry, you _________ tell the teacher if you want to...
