Exercício: Completar Frases

Estava resolvendo uns exercícios pra praticar e me deparei com esse. Minhas respostas foram:

A: aren't you
B: isn't he
A: might
B: didn't he / must
A: can't

Exercise: choose the correct words to complete the conversation.

A: You’re coming to the beach with us today,(0) ?
B: Yes, and James is coming too, (1) ? He should be here by now.
A: I guess he (2) have car troubles. His car is very old.
B: He used his brother’s car last weekend,(3) ?It was a BMW. He (4) be very rich.
A: Well, he (5) be as poor as James.

0 you aren't/ are you/ aren't you?
1 he isn't,/ is he/isn't he
2 couldn't/might/should
3 didn't he/does he/he doesn't
4 could/might/must
5 can't/might/must