—I was worried about my math，but Mr．Brown gave me an A. —______________.
A．Don’t worry about it．
B．Congratulations! That’s a difficult course．
C．Mr．Brown is very good．
D．Good luck to you!
Mother was busy washing dishes ________________ Father was watching TV．
A．until B．if C．since D．while
Shanghai is the first city in the world _____________ a high-speed maglev train，from the city to Pudong Airport．
A．building B．having built C．to have built D. built
—Is Tom still smoking?
—No．By next Saturday he _____________ for a whole month without smoking a single cigarette.
A．will go B．will have gone C．goes D．has been going
While reading an interesting story book in my room，______________.
A．the light suddenly went out
B．the doorbell rang
C．someone was shouting outside
D．I heard someone shouting outside
Mr．Black is willing to do ______________ Mrs．Black tells him to do．
A．whichever B．however C．whatever D．whenever
