. ---Where will you start your work after graduation?
---Mmm, it's not been decided yet. I ____ continue my study for a higher degree.
| A．need | B．must | C．would | D．might |
It suddenly _____ to the detective that the professor was probably murdered by his own wife .
| A．occurred | B．came about | C．took place | D．Happened |
---What made her unhappy?
---_____.
| A．Because she lost her wallet | B．she lost her wallet |
| C．Losing her wallet | D．To lose her wallet |
The machine might break down someday in the future, ____, you can dial this number for help.
| A．in that case | B．in what case |
| C．in which case | D．in whose case |
_________ returns first will win the big prize.
| A．Those who | B．Anyone who |
| C．The one whom | D．whomever |
—Mary said Leo worked really hard.
— _______.
| A．So does he and so does she | B．So does he and so she does |
| C．So he does and so she does | D．So he does and so does she |