а) 1)called /was parking

2)was driving /saw

3)wasn't watching

4)did he lie

5)was leaving /rang

6)was snowing

7)was leaving

8)wrote /were sleeping

9)was recovering

10)woke/ was getting

b) 1)sat/ drank

2)made/ cleaned

3)knoked/ was reading

4)bought/ was leaving

5)didn't meet

6)had/ was going

7)was feeling/ didn't go

8)arrived/ was introducing

9)was running/ fell/ broke

10)was teaching / met