Never give up your effort, ______ you are sure to get what you’re trying to get．
| A．and | B．before | C．or | D．but |
Everything was placed exactly _______ he wanted it for the graduation ceremony.
| A．though | B．where | C．while | D．when |
The three of us ________ around Europe for about a month last summer.
| A．have travelled | B．had travelled | C．travelled | D．travel |
He got up late and hurried to his office, ________ the breakfast untouched.
| A．left | B．leaving | C．to leave | D．leave |
We _________ the difficulty together, but why didn’t you tell me?
| A．should face | B．might face | C．must have faced | D．could have faced |
________ at the door before you enter my room, please.
| A．Knock | B．Knocking | C．Knocked | D．To knock |