A computer ______ think for itself. It’s always told to do things.A. mustn’t B. can’t C. shouldn’t
--- Could you tell us _______? ---- About five minutes.
The computer needs_________. I think I need ________ to ask Mr. Zhang for help.
---- What else do you think we should pay attention _________ our environment?---- Sorry, I’ve no idea.
It seems that the students devote much time and energy _____ a high score in the exam.
Sandy feels sure about her own ability. She is a (n) _______ person.