A survey of the opinions of experts that three hours of outdoor exercise a week good for one’s health.
A. show; are B. shows; is C. show; is D. shows; are
Only when you showed the pass to the guard to come out our school．
A．you allowed B．allowed you
C．you were allowed D．were you allowed
When you come into our school yard, you will notice our beautiful school _____by green trees.
A. surrounding B. surrounded
C. to surround D. being surrounded
