Social practice is _____ opportunity for students to gain _____ better understanding of how society operates.
| A．the; the | B．the; a | C．an; a | D．an; the |
—I left my handbag on the train, but luckily someone gave it to a railway official.
—How unbelievable to get it back! I mean, someone ________it.
| A．will have stolen | B．might have stolen |
| C．should have stolen | D．must have stolen |
They ________have arrived at lunchtime but their flight was delayed.
| A．will | B．can |
| C．must | D．should |
—Happy birthday!
—Thank you! It's the best present I________ for.
| A．should have wished | B．must have wished |
| C．may have wished | D．could have wished |
We ________ have bought so much food now that Suzie won't be with us for dinner.
| A．may not | B．needn't |
| C．can't | D．mustn't |
—Why are your eyes so red? You ________ have slept well last night.
—Yeah, I stayed up late writing a report.
| A．can't | B．mustn't |
| C．needn't | D．won't |