Choose the best answer

Choose the best answer
1.The deathrate would decrease if hygienic conditions...
.A-was.  B-is.     C-were       D-had been
2.The education in Japan .....if the basic ptinciples of education had not been taken into consideraration       
A-would go down       B-would have gone down           C-went down.              D-had gone down.                       3.If there .....the ricefields could have been more productive.                              
A-had been enough water.                                                 B-were enough water.                                                         C-would be enough water.                                               D-are enough water