You were out enjoying yourself when you ________.
| A．must have studied | B．would have studied |
| C．should be studying | D．ought to have been studying |
The door and the windows were all closed and there was no ___________ of forced entry．
| A．scene | B．signal | C．sign | D．sight |
He requires that he _______ an opportunity to explain his case．
| A．is given | B．should give | C．give | D．be given |
Mary is in bed with a fever and she can’t hope to __________ the cold in a few days．
| A．get rid of | B．get away with | C．get off | D．get out |
Most children with healthy appetites are ready to eat almost anything that is offered and a child rarely dislikes food __________ it is badly cooked．
| A．if | B．until | C．that | D．unless |
— You ought to have called him yesterday ．
— Yes，I know I ________.
| A．ought to | B．have to | C．should have | D．must have |