Why didn't you tell me there was no meeting today? I all the way here through the heavy snow.
| A．needn't have driven | B．can't have driven |
| C．mustn't have driven | D．shouldn't have driven |
Wethe difficulty together, but why didn't you tell me?
| A． | should face | B． | might face |
| C． | could have faced | D． | must have faced |
Birds' singing is sometimes a warning to other birds ______ away.
| A．to stay | B．staying | C．stayed | D．stayed |
______ at the door before you enter my room, please.
| A．Knock | B．Knocking | C．Knocked | D．To knock |
Our friendship ______ quickly over the weeks that followed.
| A．had developed | B．was developing |
| C．would develop | D．developed |
-Have you heard about that fire in the market?
-Yes, fortunately no one ______.
| A．hurt | B．was hurt | C．has hurt | D．had been hurt |