—Must I buy lunch at school?—No, you needn’t. You __________ bring your own lunch if you want to.

The careless man received a ticket for speeding . He ____ have driven so fast .

 The boss has given everyone a special holiday, so they      go to work tomorrow .

—It’s hard to believe that Jack ________ have fought with the policeman.—Yes.If one ________ ask for trouble, it can't be helped.

—There aren’t any toys in our suitcase．Where have you put them?—Oh, no．That old lady sitting next to us ______ have taken ours by mistake.