Look, so many people are running out of the station. I wonder what ________.
| A．is happened | B．was happening |
| C．is happening | D．had happened |
—How long has Eliza been a nurse?
—___________.
| A．Since 2002 | B．Four years ago |
| C．In 2002 | D．For 2002 |
—Have you ___________ been to Beijing?
—Yes. But only once.
| A．never | B．ever | C．yet | D．before |
I think Internet is ___________ than books.
| A．important | B．importanter | C．much important | D．much more important |
Simon’s shirt is the same size ___________ mine.
| A．for | B．as | C．to | D．at |
You ___________ follow the traffic rules. Otherwise, it is dangerous for you.
| A．must | B．can | C．may | D．should |