----What do you think of the book?----I don’t think it’s ______ useful book.
We __________ buy the train tickets. We can book one by phone now.
Sam did very well in the English exam. He made _______ mistakes.
You’d better go over your test paper carefully, _______ you won’t get a good mark.
My mother won’t let me ________ the cell phone when I do my homework.
I haven’t seen the film “Cinderella(灰姑娘)”and __________.