--- Why didn’t you ring me up when Sue arrived?
---sorry, I ______ my essay that was to be handed in by noon.
| A．had written | B．wrote |
| C．have been writing | D．was writing |
It's OK to________an electrical appliance on so long as you are using it.
| A．leave | B．make |
| C．turn | D．open |
It________heavily for 2 weeks and the farmers were very worried.
| A．has been raining | B．had been raining |
| C．has rained | D．had been rained |
You cannot tell________looking at someone whether or not he has HIV.
| A．without | B．by |
| C．for | D．with |
The days are gone________you can breathe fresh，unpolluted air or drink clean, unpolluted water in the countryside.
| A．when | B．that |
| C．where | D．which |
Learn some relaxation exercises and do them every time you feel________.
| A．embarrassed | B．stressed |
| C．ashamed | D．impressed |