Students should involve themselves in community activities they can gain experience.
---Did the policeman let you in? ---No, I told him who I was.
I wonder if your sister will go to Mary’s birthday party.If she_______,so ______ I.
The police were seeking more information to find out _______the rich merchant.
Not until he called the secretary three times ______ that the manager went to an important meeting.
In one corner of the garden there stands a little board,_______“Keep off the grass.”