The biggest problem for most plants, which _______ just get up and run away when threatened, is that animals like to eat them.
| A．shan’t | B．can’t | C．needn’t | D．mustn’t |
Thirty years ago this month，China's leaders launched an economic revolution.___________the door to free market reforms and foreign trade．
| A．to open | B．opened | C．opening | D．having opened |
According to a UN report，30 percent of the world population have no______to clean drinking water and health care.
| A．means | B．approach | C．channel | D．access |
It's reported that at least one Chinese vessel________in the hands of attackers in Somalia so far.
| A．had been | B．has been | C．was | D．is |
The city of Rome has just passed a new law to prevent cruelty to animals，which many people say can___the civilization of a city．
| A．manage | B．separate | C．handle | D．measure |
The experiment is______failure．But do remember that，in the face of failure，you should still keep up good state of mind．
| A．/；the；the | B．a；/；the | C．the；/；the | D．a；/；a |