（1）His father is a doctor. His mother is a doctor，too.
His ___ ___ ___ doctors.
(2) When I was young，I usually had no money.
When I was young，I ___ ___ to have any money.
(3) She is our teacher. She is also our friend.
She is our teacher ___ ___ ___ our friend.
(4) Some boys like swimming. Some boys don't.
____ ____ the boys like swimming.