Ⅰ.单项填空
1．—Is everyone here?
—Not yet...Look，there________the rest of our guests!
A．come B．comes C．is coming D．are coming
2．John opened the door.There________he had never seen before.
A．a girl did stand B．a girl stood C．did a girl stand D．stood a girl
3．Not until he left his home________to know how important the family was for him.
A．did he begin B．had he began C．he began D．he had began
