When I said some students were so lazy, I ___to you.
| A．don’t refer | B．wasn’t referring | C．didn’t refer | D．hasn’t referred |
Not until I went through his paper ___ what rapid progress he had made in writing.
| A．I did find |
| B．did I find |
| C．I had found |
| D．was I found |
In front of the classroom___
| A．is the desk for the teacher |
| B．has the desk of the teacher |
| C．it is a desk for the teacher |
| D．has it a desk of the teacher |
___sign the contract unless you are sure you understand it.
| A．In no case should |
| B．In any case you should |
| C．In no case should you |
| D．In any case should you |
Eyewitness provides an evidence that he was ___ of the crime.
| A．guilty |
| B．concerned |
| C．cautious |
| D．mistaken |
Wash your hands with soap and water ___ after each contact with the sick person.
| A．occasionally |
| B．thoroughly |
| C．scarely |
| D．enough |