Unit10 You’re supposed to shake hands.SectionB (3a--Self-check)I. 单项选择:(BC 层学生必做,A 层选做或不做) ( )1. ---Sorry, sir. 1 haven’t finished the report yet. -- ___________. It is due in a week.A.It’s up to youB. It’s no big dealC. Well, that's too bad D. Well, it's hard to...