A computer ______ think for itself. It’s always told to do things.A. mustn’t B. can’t C. shouldn’t
Old Henry _________ take his dog for a walk after supper. But these days he is too weak to do that.
There are about more than five ___________ "left-behind" students (留守学生) in China.
He doesn’t know _________ English because he has studied it for only ________ weeks
She likes musicians __________ write their own lyrics.
Jane studies chemistry ________ asking the teacher ________ help.