Решение:
Чтобы закончить предложения, нужно использовать условные конструкции с If, выражающие прошлые или несостоявшиеся события (Third Conditional) и их результаты.
- If you had built the wall properly, it wouldn't have fallen down.
- If the bus service wasn't poor, we could go shopping in town.
- If you promise to be good, she will take you with her.
- If Bob's help, we won't finish the job on time.
- If we hadn't spent so much on holiday, we would have enough money to buy a new carpet.
- If I hadn't been listening to my stereo, I would have heard the telephone ring.
Ответ: 1. had built, 2. wasn't poor, we could go, 3. promise to be good, she will take, 4. 's help, we won't finish, 5. hadn't spent so much on holiday, we would have enough money, 6. hadn't been listening to my stereo, I would have heard.