--____ you come to my birthday party tomorrow, Robert? --I’m afraid not. I have to study for my exam.
She said she returned the book to the library.I'm sure she ________.
一Do you know why he didn’t ________ a word when he ________ to? —Because he was too nervous.
—Do you know the price of the ticket? —Yes.Each ________ ¥180.
You mustn’t go off on your own,because you ________ get lost in the mountains.
一Diaoyu Island belongs to China. 一Surely it does! We Chinese never ________ it up.