英语填空.(must,may,can't,could)1,a:He's ten years old,but he sti

英语填空.(must,may,can't,could)1,a:He's ten years old,but he still__read.b:You __ be serious!2.a:The door is open.someone__have come in while i was out.b:Really?You__call the police immediately!3.a:__I have a look at my test scores?b:Of course,but be prepared!You__not like what you see!4,a:Thanks for inviting me!I__come,but i have some housework to do first!b:Well,just ask me!i__come over and help you.