单项选择题
Studies show that if a working environment is pleasant,（）will be higher.
A.productive B.productivity C.production D.produce
单项选择题 People should take holidays, otherwise they will get（）and leave the company
单项选择题 I still enjoyed the week（）the weather.
单项选择题 At the moment our technology is more advanced than theirs, but they are（）fast.
