—How unhappy your roommate looks!
—Yes, but he's not willing to tell me what it is ________ is troubling him.
A．what B．which
C．as D．that
When the millionaire was young, he was very poor. Only by doing parttime jobs during the summer holiday ________ afford to pay his college fees.
A．he could B．could he
C．can he D．he can
So quickly ________ is a possibility today may be a reality tomorrow.
A．are science and technology advancing that
B．science and technology advancing are that
C．science and technology are advancing what that
D．are science and technology advancing that what
The Chinese government promised that under no circumstances ________ the efforts to provide universal and lowcost health care.
A．it would stop B．it might stop
C．would it stop D．might it stop
Kate had a terrible time this summer. Not a day ________ without having some unpleasantness with her sister at home.
A．she spent B．she had spent
C．did she spend D．had she spent
________ who had arrested him three times for carrying drugs.
A．Before George stood the policeman
B．Before George the policeman stood
C．Before the policeman stood George
D．Before George did the policeman stand
