Was it because Jack came late for schoolMr. Smith got angry?
| A． | why | B． | who | C． | where | D． | that |
----It is ______ that self-protection education is required at school.
----I agree. We always have a large course ______ months.
| A．certainly; every a few | B．certain; every few |
| C．sure; every a few | D．surely; every few |
If he is once ______ laughing, he finds ______ difficult to stop.
| A．set about; that | B．set out; this | C．set force; which | D．set off; it |
The hotel porter ______ anybody who wasn't wearing a collar and tie.
| A．turned to | B．turned off | C．turned away | D．turned up |
Nothing ______ stop us from ______ this plan.
| A．will; carrying along | B．is to; carrying away |
| C．is going to; carrying up | D．shall; carrying out |
_____ medicine works in a human body is a question ____ not everyone can understand fully.
| A．How; that | B．That; which | C．That; which | D．What; that |