24．Last Monday，while the students on the playground watching the national flag
being raised，something unexpected ．
| A．were standing；arose | B．stood；was arising |
| C．had stood；had arisen | D．would stand；would arise |
20. They _____the battle but lost many men．
| A．gained | B．won | C．defeated | D．beat |
17. It’s known that taking exercise______your health.
| A．do good to | B．does good to | C．is good to | D．are good for |
32. After he left college, he was employed in an international company and _______ there ever since.
| A．worked | B．has worked | C．had worked | D．was working |
29. New ways _____ to prevent the river _____.
| A．have found out, from polluting |
| B．have found, from being polluted |
| C．have been found out, from being polluted |
| D．have been found, from being polluted |
28. The first thing she did _____ up to her trainer and thanked her.
| A．was go | B．was going | C．and went | D．Go |
—Why! Where’s my mobile phone? Maybe I left it on the plane.
—My goodness! You things behind.
| A．haven’t left | B．didn’t leave | C．had never left | D．never leave |
16. After he left college, he was employed in an international company and _______ there ever since.
| A．worked | B．has worked | C．had worked | D．was working |
At the end of the meeting, it was announced that an agreement ________.
| A．has been reached | B．had been reached | C．has made | D．signed |
More than a dozen students in that school _______ abroad to study medicine last year.
| A．sent | B．were sent | C．had sent | D．had been sent |