Verified answer

6

3 The houses used to be cheap.

4 The streets used to be clean.

5 There used to be no litter in the streets.

6 The parking lots didn't use to be always full.

7 There didn't use to be so much traffic on the roads.

8 It used to be quiet at night.

9 We used to have a park.

10 There didn't use to be any blocks of apartments.

7

3 This book is easy to read.

4 It was great to see you last night.

5 It's easy to make mistakes when you're learning a language.

6 It's important to keep vocabulary lists.

7 I'm pleased to see you've stopped smoking.

8 It's impossible to keep the house neat with five children.

9 It's unusual to have long, hot summers in San Francisco.