In many cities of China, if an ambulance is_______ in a traffic jam, police will respond to the emergency．
| A．held up | B．held back |
| C．held down | D．held out |
The train ____ at present speed until it reaches Beijing.
| A．is running | B．will be running | C．will have run | D．has run |
Before becoming a pilot, he spent quite a long time ____.
| A．to be trained | B．being trained | C．training | D．to train |
Yang Liwei’s journey into ____ space took him 600,000 kilometres in ____ orbit, around the earth 14 times, in just over 21 hours.
| A．a, an | B．the, an | C．不填，不填 | D．the, the |
____ it is to skate on real ice in winter!
| A．What fun | B．What a fun | C．How fun | D．How a fun |
The vegetables didn’t taste good. They ____ too long.
| A．had cooked | B．cooked | C．had been cooked | D．were cooked |