John and I _____ friends for eight years. We first got to know each other at a Christmas party. But we _____ each other a couple of times before that.
-----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______.
Coming into the room, I found them ______ at the table, _____ chess.