Choose the suitable one. [→L.19] (1) You(should / would ) be quiet in this room. You can talk out in the hall. (2) I want to study abroad, so I ( must / mustn't ) study English hard. It's still very young. (3) Students ( must / mustn't ) walk on the grass. It probably took you (4) I(must / had to ) clean the classroom yesterday. - a long time. (5) Must I attend the meeting tomorrow? No, you( don't have to / mustn't ). (6) You are going to go swimming tomorrow, so you( should / shouldn't ) finish your homework today. (7) Kaori's umbrella is here. She ( must have / can't have ) taken mine. (8) I can't find my wallet in my bag. I (should have / may have ) left it at home. (9) The party was a lot of fun. You( must have / should have ) come. (100 Kenji ( can't have / must have ) told a lie. He is an honest boy.