Mr. Green is said _____ an experiment to prove the new method of solving the problem when young.
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?