It shows that____ knowledge of first aid can make a real difference.
| A．a | B．the | C．one | D．/ |
George once told me that he would visit our house，but，for various reasons，he ________so far．
| A．didn't | B．hasn't | C．hadn't | D．wouldn't |
Premier Li Keqiang delivered a speech at the conference, _________ university graduates to start their own business.
| A．encouraging | B．to encourage |
| C．having encouraged | D．encouraged |
—What do you think of the Huawei P7?
—Terrific, I would buy one if I ______ an iPhone 6 Plus last year.
| A．didn’t buy | B．don’t buy |
| C．hadn’t bought | D．haven’t bought |
______ worries me that my daughter plays with her cellphone for a long time every day.
| A．It | B．What | C．This | D．That |
—Has James arrived at the hotel?
—No, he ______ by fans for photographs at the airport.
| A．has surrounded | B．would surround |
| C．was surrounded | D．is being surrounded |