ответ:1) They (were watching) TV when the lights (went) off.
2) They (did not see) me because they (were talking) to each other.
3) While the children (were sleeping), their parents (were watching) TV.
4) It (started) to rain while she (was watering) the flowers in her garden.
5) This time last week I (was lying) on the beach.
6) While he (was taking) a shower, his dogs (ate) his steaks.
7) When they (left) the museum, the sun (was shining).
8) We (were walking) in the mountains when we (heard) a piercing scream.
9) I (was having) a beautiful dream when the alarm (went) off.
10) When the teacher (arrived) all the students stood up.
11) Were you (playing) a musical instrument when you (were) a kid ?
12) We (was going) down the road at 100 kph when the wheel (fell) off.
13) He (came) in, (took) off his coat and (sat) down.
14) Yesterday I (spent) two hours cleaning my living room.
15) I (finished) work, (walked) to the beach, and (found) a nice place to swim.
P.s сори если не правильно я плохо английский язык знаю я перевёл и ели как понил
2) Lively traffic can be seen in Moscow
3) I don't bring in constant noise and pollution
4) I suggested creating an English language club
5) I want to save the environment
6) The cost of living is high in London
7) Peace and quiet are important to me
8) My classmates are friendly and willing to help people
9) We have beautiful landscapes
10) Robbers steal things from people's homes
11) You have to install an alarm
12) Agatha Christie is a world famous writer
13) She was born in 1890