. When he ______ the door, he found his keys were nowhere.
| A．would open | B．was to open | C．had opened | D．opened |
I have lost one of my gloves. I _____ it somewhere.
| A．must drop | B．must have dropped |
C．must be dropping | D．must have been dropped |
— Write to me when you get home. — __________.
| A．I must | B．I should | C．I will | D．I can |
If I hadn’t stood under the ladder to catch you when you fell, you _____ now.
| A．wouldn’t be smiling | B．couldn’t have smiled | C．won’t smile | D．didn’t smile |
—Could I borrow your dictionary?-—Yes, of course you _____.
| A．could | B．will | C．can | D．might |
Mr. Bush is on time for everything. How _____ it be that he was late for the opening ceremony?
| A．can | B．should | C．may | D．must |