My father (smok) ............ alot when he was small? Please keep silent. someone (knock)......... at the door? She asked me whether I(like)..... trying that kind of food

1 my father (smok) ............ alot when he was small
2 please keep silent. someone (knock)......... at the door
3 she asked me whether I(like)..... trying that kind of food
4public transprt shoulld(use).......... to save the environment