Do, does, is, are, work, works

1 . -
A : What ____________________ your brothers ____________________ ?
B : They ____________________ firefighters .
A : Where ____________________ they work ?
B : They ____________________ at the fire station .

2 . -
A : What ____________________ your sisters ____________________ ?
B : They ____________________ nurses .
A : Where ____________________ they work ?
B : They ____________________ at the hospital .

3 . -
A : What ____________________ your dad ____________________ ?
B : He ____________________ a waiter .
A : Where ____________________ he ____________________ ?
B : He ____________________ at a restaurant .