【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.