--I’m afraid Mr. Wood can’t see you until 4 o’clock;--Oh, ______ I won’t wait.
----It is ______ that self-protection education is required at school. ----I agree. We always have a large course ______ months.
If he is once ______ laughing, he finds ______ difficult to stop.
The hotel porter ______ anybody who wasn't wearing a collar and tie.
Nothing ______ stop us from ______ this plan.
_____ medicine works in a human body is a question ____ not everyone can understand fully.