They were abroad during the months when we were carrying out the investigation, or they _____ to our help.
| A．would have come | B．could come |
| C．have come | D．had come |
Living in the dormitory means _______ to take care of yourself, understand each others' differences and share_______ interests.
| A．to learn, common. | B．learning, ordinary |
| C．to learn; ordinary | D．learning; common |
With consumers searching _______ ways to cut daily expenses, officials from the National Bureau of Statistics' economic monitoring center say there's no need _______.
| A．of; in panic | B．to; panic | C．for; to panic | D．in; panicked |
President Hu Jintao has met with _______ UN Secretary General Ban Ki-moon at the Great Hall of the People in Beijing. President Hu welcomed Ban's China _______ and his attendance at the Shanghai World Expo.
| A．visiting; visit | B．to visit; to visit | C．visited; visiting | D．visiting; visited |
Mass deaths of birds were not unheard of, but they normally happened unnoticed at sea or in rural areas away from towns. Many birds are weak and die in winter _______ food is scarce.
| A．which | B．what | C．when | D．how |
There was no sign _______ they had died from diseases such as bird flu - the main worry in such cases. Among the theories was _______ a truck had collided（碰撞）with the crowd.
| A．/; that | B．that; that | C．that; which | D．that; / |