Scientists think they have _____ in their attempt to find the causes of some major dieases.
After I had finished eating, he advise me ______ immediately.
-----This returned Chinese scholar has become one of the top experts in this field. -----Yes, I know him very well. He _____ in Africa with wild animals for eight years.
All made possible for China to succeed in carrying on its reforms and open-door policy.
The pencil which you wrote just now me.
The government tried its best to _____ the people’s needs, but the people were still not ______. In fact, what the government did was not______.