Fill in the blanks with correct form : 

a) He would understand it if you would (explain) it to him more slowly.

b) I shall pay you now for what you have (do).

c)The ( burn) of fossil fuel,forest and various pollutants is the source of carbon - dioxide gas.

d) Mike wished that the editor (permit) him to copy some of their materials. 

e) Proper steps should be ( take) against corruption.