Compound sentences

Which conjunction do you use?

I really need to go to work,... I am too sick to drive.

He ran out of money,... he had to stop playing poker.

They got there early, ... they got really good seats

Everyone was busy, ... I went to the movie alone

(a)  

I thought the promotion was mine, ... my attendance wasn't good enough.

Should we start class now, ... wait for everyone to get here?

It was getting dark, ... we wasn't near the cabin yet.

It's raining outside, (a)   remember to bring umbrella with you

I want to eat pizza,... I don't have money

(a)  

You have to be hurry up, (a)   you will be late