China _______ rapid progress in space technology in the last 10 years.
| A．made | B．has made |
| C．had made | D．were making |
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 |