Jack wasn’t saying anything，but the teacher smiled at him ________he had done something very clever．
A．as if B．in case
C．while D．though
US President Barack Obama ________ a national speech at the 10th anniversary of 9/11 terror attacks．
A．addressed B．delivered
C．spoke D．recited
Mistakes don’t just happen; they occur for a reason. Find out the reason, and then making the mistake becomes ______.
A. favorable B. precious C. essential D. worthwhile
－It’s necessary to limit the speed of electric bikes.
－Yes, most riders of electric bikes in China 40-50 kilometers per hour often ignore red lights, the risk of traffic accidents.
A. reaching; increase B. reach; increase
C. to reach; to increase D. reaching; increasing
—Well，I do think the ipod is smart, convenient and intelligent．
—________．
A．So it is B．So is it
C．So does it D．So it does
— Did you hear about Zhang Lili who saved the kids from being run over by a school bus?
— Yes. What do you think most people _____ if they were in a similar situation?
A. will do B. will have done.
C. would do D. would have done
