The manager has ____to improve the working conditions in the

The manager has ____to improve the working conditions in the ————has been done to improve the working conditions. ______has been done to improve the working conditions A,a lo in the conditions 和 under the conditions the manager has been telling the works how to improve the pr their working conditions ( )the same ( )before ___has recently been done to improve the conditions of eleme 如何区别in the conditions 和under the conditions Working conditions in the factory are ___ few workers stay l The manager tried to improve the company's__but failed. The manager's health has( )from overwork in recent months The worse working conditions we are looking forward to _____