The teacher frowned ___ annoyance when a studentfell asleep during his lesson

rus came without people’s being aware of it and it was ________ assumed to be a common one. But with more cases reported, it proved wrong.

Where did you get this book—I picked it up from a second-hand bookshop if you______ know

It _____ her half an hour _____ to school yesterday.

I asked him to _______ me a few minutes so that we could go over all the problems.[ ]