Only when I left my parents for Italy ________ how much I loved them.
| A．I realized | B．I had realized | C．had I realized | D．did I realize |
—I’m sorry. I ___________ at you yesterday.
— Forget it. I was also a bit out of control myself then.
| A．shouldn’t shout | B．mustn’t shout |
| C．shouldn’t have shouted | D．mustn’t have shouted |
The medicine will make you sleepy. You _______until this afternoon. 
| A．would better not drive | B．would better not to drive |
| C．had better not drive | D．had better not to drive |
A great number of people were killed in the big fire, and the number of the people who _____ missing _______still increasing.
| A．were; was | B．are; is | C．were; is | D．are; was |
Stand over there, _____ you will be able to see it better.
| A．or | B．but | C．while | D．and |