Below are the answers to the exercises on the image:
### Section 1.7.1
1) Jane **was** tidying her room when her mother came.
2) What **were** the children doing when their mother called them?
3) Pete **was** finishing his homework when the phone rang.
4) The children **were** swimming in the river after lunch.
5) Jack **was not** watching TV when his friend came to see him.
6) Ann **was** playing the piano at 7 p.m. yesterday.
7) **Was** it raining yesterday?
8) We **were** leaving home when it started to rain.
9) Who **was** answering the question when you came in?
### Section 1.7.2
1) When **did** Mark leave school?
2) What **was** Jack doing yesterday in the evening?
3) He **did** not call Pete last night.
4) **Did** the children come to school in time yesterday?
5) Who **was** speaking to your teacher when you came into the classroom?
6) **Did** you hear a strange noise last night?
7) What **was** Helen wearing at the party?
8) How many photos **did** you take?
9) It **was** getting dark very quickly.
10) The child **was not** sleeping when we came.
### Section 1.7.3 (Tag Questions)
1) The boy looked scary, **didn't he**?
2) Her hair was long and grey, **wasn't it**?
3) The story didn’t begin at night, **did it**?
4) It was raining hard that morning, **wasn't it**?
5) The boy fell down, **didn't he**?
6) He didn’t hurt himself, **did he**?