How can they learn anything useful ______ they spend all their spare time playing online games?
A. while B. unless C. although D. when
______ is it that metals plays such an important part in our daily life?
A. Why B. What C. Where D. When
Early this year cruel snowstorms hit southern China, great transportation problems in some areas.
A．caused B．to cause C．having caused D．causing
--- Why can’t I smoke here?
--- At no time in the meeting room.
A．is smoking permitted B．smoking is permitted
C．does smoking permit D．smoking be permitted
Don’t interrupt me, John. you force me to tell you the truth at the moment?
A．Might B．Must C．Should D．Would
It was not until dark he found he thought was the correct way to solve the problem.
A．that; what B．that; that C．when; what D．when; that
