—What caused the accident?

—It was my fault, sir. I _____ to the left.

A. ought not to have turned       B. needn’t have turned

C. shouldn’t turn               D. couldn’t turn

— Catherine, I have cleaned the room for you .
— Thanks. You_______. I could manage it myself.

— Catherine, I have cleaned the room for you.

— Thanks. You ______ it. I could manage it myself.

A. needn’t do               B. needn’t have done

C. mustn’t do               D. shouldn’t have done

I didn’t see her in the meeting-room this morning. She____ at the meeting.

A. mustn’t have spoken                   B. shouldn’t have spoken

C. needn’t  have spoken                  D. couldn’t have spoken

.--Your parents were anxious about you. You _____ home without saying a word.

  -- It’s my fault.

   A. mustn’t be                           B. shouldn’t have left 

   C. needn’t have left                    D. couldn’t have left