VERBS IN THE PAST TENSE

                            WHO WAS IT?




                        Last night was reading a magazine when I heard somebody knocking at the door.
                I got up went to the door and opened it but nobady was there.
                It is stange, isn't it?
1-Answer these questions:
a-what was i reading last night?
b-what did hear?                                 
c-what did i do?
d-who was at the door?