Try not to cough more than you can _______ since it may cause problems to your lungs.
| A．check | B．allow | C．stop | D．help |
---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 |
— I regret _______ you that you failed the exam.
— How I regret _______ so much time playing computer games.
| A．telling; wasting | B．telling; to waste |
| C．to tell; wasting | D．to tell; to waste |