1.---How long has he been away____ from here?
---Two years.He'll return in a week.
2.There is plenty____ of rain in North China in summer.
3.More food must be produced to satisfy____ the incresing population.
4.The cost___ of this fridge is 2000 yuan.
5.Two students are playing the violin;the rest____ of the class are listening carefully.
6.The summer camps provide____ good jobs for some older students.