There is no doubt that he is a good professor__________he is doing fine.
| A．but | B．because | C．so | D．yet |
Mary was much kinder to Jack than she was to the others, ___, of course, makes all the others upset.
| A．who |
| B．which |
| C．what |
| D．that |
As is known to all, ___ People’s Republic of China is ___ biggest developing country in the world.
| A．the;不填 |
| B．不填; the |
| C．the; the |
| D．不填;不填 |
—Sorry I’m late.I got stuck in traffic.
—___.You’re here now.Come in and sit down.
| A．You are welcome |
| B．That’s right |
| C．I have no idea |
| D．Never mind |
It is important to have your eyes examined regularly to check for any sign of eye disease that may not have any ___.
| A．symptom |
| B．similarity |
| C．sample |
| D．shadow |
Internet is as___to learning as the ability to understand, even more so.
| A．vital |
| B．available |
| C．specific |
| D．similar |