Which answer is correct?

Hi there.
I came across some "fill in the missing words" sentences. Most of them I could solve, but I'm not sure about these ones:

Everybody was there ... my best friend who couldn't come.

a) beside
b) besides (x)

Before ... we wrote a message for him.

a) we leave
b) we have left (x)
c) leaving
d) we will leave

We had an accident yesterday and father took the car to the mechanic. Now our car is... .

a) being repaired (x)
b) repair
c) repairing
d) being repair

I know I ... before you came back home from work.

a) should do it
b) should did it
c)should have done it (x)
d) could do

They ... if they had had your phone number.

a) called
b) would call
c) would have called (x)
d) would called

You needn't have ... potatoes. We are going out to dinner tonight.

a) peel
b) peeled (x)
c) peeling
d) peelt

I always travel with as ... as possible.

a) little luggages
b) few luggages
c) few luggage
d) little luggage (x)

Mother has told me that I ... visit him because we are all going to him tomorrow.

a) must
b) needn't (x)
c) mustn't
d) can't

I marked with (x) the ones I thought to be the right answers.

Tell me your opinion, please. Thank you very much.