smart! This new kind of taxi can go without a driver．
Amazing! Let's have a try． （ ）
A．WhatB．HowC．What a
We each other since I came to Beijing， but we send emails very often．（ ）
A．don't seeB．didn't see
C．won't seeD．haven't seen
I on the computer when Frank called me last night．（ ）
A．workB．will work
C．was workingD．am working
If you take this train， you in Shanghai in five hours．（ ）
A．arriveB．will arrive
C．arrivedD．have arrived
Zhaozhou Bridge is one of stone bridges in the world．（ ）
A．oldB．olderC．oldestD．the oldest
﹣ do you visit your grandparents，Tom？
﹣Twice a month．（ ）
A．How muchB．How oftenC．How longD．How soon