．—What’s the matter with the man hanging his head there? —Well, if you _______ know, he was caught stealing my bike.

. Mary said it was very important to her that she _____ her work.

—I _____ thank you enough for what you have done for me. —You’re welcome.

__ It is so late. Our son __________ be back . __ Don’t  worry . I dare say he ________ have some extra work to do.

—Why didn’t you put your cellphone in your overcoat pocket?—I      , but I was afraid it would be stolen.