used to / didn't use to

What did people _____ do to keep in touch?

• did use to

• use to

• used to

In the past, people ______ write emails.

• did use to

• didn't use to

• didn't used to

What ______ people use to do to cook their food?

• do

• did

• didn't

Long ago, people didn't ______ cook in microwaves.

• used to

• use to

• did

What _____ people use to do to travel?

• didn't

• did

• do

In the past, people _____ travel by horse and buggy

• used to

• didn't used to

• use to

What did people______ to do to call each other?

• use to

• used to

• did use to

100 years ago, people______ have cell phones.

• didn't use to

• used to

• did used to