1.------- no exercise-book,he had to write on a piece of pap

1._______ no exercise-book,he had to write on a piece of paper.A.There was B.There is C.There being D.There having 2.In another year or so,you___all about itA forget B would forget C have forgotten D will have forgotten 请问这两个该选什么,为什么,第二个如果是虚拟语气为什么不能用B?第二道题是将来时也因该是will forget，为什么会是将来完成时呢？