There's a __________ in our office that when it's somebody's birthday, they bring in a cake for us all to share.
| A．tradition | B．balance |
| C．concern | D．relationship |
He decided that he would drive all the way home instead of __________ at a hotel for the night.
| A．putting down | B．putting off |
| C．putting on | D．putting up |
— 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 |
Most American children go to state schools, but the private schools __________ be very good.
| A．must | B．can |
| C．should | D．ought to |
Since nobody gave him any help, he __________ have done the research on his own.
| A．can | B．must |
| C．would | D．need |
—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 |