Помогите решить тест с разъяснение пожалуйста)1.How can I ... to the

Помогите решить тест с объяснение пожалуйста)
1.How can I ... to the post-office?
a)rerch
b)get
c)find
d)arrive
2."what is he doing?" "..."
a)He's an economist
b)he's having lunch
c)he's doing it
d)he has lunch
3.As soon as I shut the front door I realosed that I .... my key in the house.
a)had left
b)have lleft
c)left
d)was leaving
4.How ... of matches have we got?
a)much boxes
b)many box
c)much box
d)many boxes.
5.This film was ... interesting than last week's
a)not so
b)should
c)am going to
d)will