【英语】用must,might,can,could或can't完成下面对话.

【英语】用must,might,can,could或can't完成下面对话.A:Tina you look worried.What's wrong?B:i can't find my english book.where___ it be?I___have lost it.A:Don't worry.Let's see where it___ be.B:I think I___ leave it in the reading room.But is isn't there.A:What does your book look like?Let's look for it together.B:it's blue.A:Oh,look!Is this one yours?B:NO.It___ be mine.Tom's name is on it.A:i'm afraid you have to buy a new one.