.
He _________ at once when I promised to help him.
| A．cheered up | B．gave up | C．lighted up | D．turned up |
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 |
Many young people don't work hard, and regret it later when the opportunity is gone.They only realize it________it is too late.
| A．when | B．before |
| C．in case | D．until |