Effective measures should ________ and laws should _______ to protect pandas. Otherwise, they are certain to die out.
| A．be taken; be passed |
| B．take; pass |
| C．be made; be taken |
| D．be set; be made |
The tree over there is so tall that I suppose it _______ nearly twenty metres.
| A．measures |
| B．is measured |
| C．measure |
| D．to be measured |
On arrival, the famous movie star found himself _______ by the enthusiastic fans.
| A．to be surrounded |
| B．surrounded |
| C．being surrounded |
| D．having surrounded |
Modern science has given clear evidence ________ smoking can lead to many diseases.
| A．what |
| B．which |
| C．that |
| D．where |
When the news came ________ the war broke out, he decided to serve in the army.
| A．since |
| B．which |
| C．that |
| D．because |