No student ______ go out of school for snacks during the break without the teacher’s permission.

will be sad because humans will have learnt tofix many of the problems that affect us now, like war, pollution and hunger,________

Do you know _______ the girl in red is—I’m not sure. Maybe a doctor.

_____ in her maths homework, Amy kept thinking and writing for an hour in her study.

_____ is all that I can spare. Which is wrong? [ ]