170. So long as you work hard enough, a(an) _____ rod can be ground into a needle. (prov.)
In the west, people make _______ a rule to send Christmas present to their relatives and friends.
Why don’t you bring ______ to his attention that you are too busy to do it?
They live on a busy main road. ______ must be very noisy.
They are good friends. _______ is no wonder that they know each other so well.
Does ________ matter if he can’t finish the job on time?