With the development of science and technology ，5G _____ to help us live more conveniently．（ ）
A．usesB．is usedC．can useD．used
The Forum（论坛）on China﹣Africa Cooperation Meeting will take place in Beijing this year．
Yes． I hear thousands of guests to the meeting then．（ ）
A．will be invitedB．will invite
C．are invitedD．invite
The second C919 large passenger plane its first flight at Shanghai Pudong International Airport on December 17th， 2017．（ ）
A．completesB．completed
C．has completedD．was completing
The traffic is terribly busy in the morning． You'd better avoid in the center of the city．（ ）
A．driveB．drivingC．to driveD．driven
High﹣speed railways have developed rapidly in our country． Today China has high﹣speed rail network（铁路网） among all the countries in the world．（ ）
A．longB．longer
C．the longerD．the longest
China's star skater Wu Dajing won the gold in the men's 500 meters in Pyeong Chang Winter Olympic Games， setting a world record time of 39.584 seconds．
exciting news it is! Let's give him the thumbs﹣up（点赞）!（ ）
A．WhatB．What anC．HowD．How an