Jack must be worried about something．You can it from the look on his face．
| A．regard | B．recognize | C．read | D．realize |
Will knew there was no doubt ______ that patch of grass on the other side was in a different world.
| A．which | B．what | C．that | D．whether |
When someone talks, everyone is expected to listen, no matter how ______.
| A．the person’s speaking may be dull |
| B．dull the person’s speaking may be |
| C．may the person’s speaking be dull |
| D．dull may the person’s speaking be |
The teacher _____ the students how to improve their writing skill since last term.
| A．has told | B．is telling |
| C．has been telling | D．will have told |
______I open my mouth, I put my food in it.
| A．At times | B．Some time |
| C．Every time | D．By the time |
The computer system suddenly_____ while he was searching for information on the Internet.
| A．broke out | B．broke up |
| C．broke in | D．broke down |