—China is developing rapidly.
—Yes, to make our country more prosperous, we should firmly the principle of scientific development.
A. contribute to B. subscribe to C. stick to D. turn to
Saving and recycling are long-term projects _______ determination matters a great deal.
A. that B. which C. whose D. where
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
