He expressed his gratitude to his head teacher, without _______-help he wouldn’t have made such great progress in his studies.
| A．whose | B．his | C．whom | D．which |
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 |
________ with care, one tin will last for six weeks.
| A．Use | B．Using | C．Used | D．To use |
— Can I have a day off tomorrow, Mr. Johnson?
— ________. I can manage without you.
| A．Forget it. | B．I’m afraid not. | C．It depends. | D．Of course. |