1. The top leaders of the two countries are holding talks in a friendly_____.
A．atmosphere B．state C．situation D．phenomenon
2. Bill was doing a lot of physical exercise to build up his ______
A．ability B. force C．strength D．mind
3 People around the world are becoming more and more _____ about the population explosion.
A．concerned B．interested C．involved D．disappointing
4．Don’t be ____by products promising to make you lose weight quickly.
A．taken off B．taken out C．taken away D．taken in
