l followed my teacher's a___ and bought an English-English dictionary.
2.Air pollution is one of the problems that we can't afford to i__.
3.Can you explain the r___ behind the decision?
4.Jane,who grows up in a circus ,is able to c___ with all the animals.
5.Any student who is caught c___ will have to leave the classroom
6.He was u___ at not being invited
7.Our nation has been developing ____(迅速地) in science and technology.
8.A whole basin of water in the freezing weather may be turned into a b___of ice.
7中的迅速地，fastquickly用哪个，有什么区别？
