Have to / Don't have to

In the past, people__________(had to/didn't have to) spend a lot of time doing housework.

Nowadays, an office worker________(has to/ had to) learn to use computer.

Nowadays, people ______(didn't have to/don't have to) wash clothes by hand.

Two hundred years ago, most children___________ (didn't have to/ don't have to) go to school.

Nowadays, people ______(have to/has to) spend a lot of less time on housework.

In the past, people__________(had to/has to) wash clothes by hand.