Ответы и объяснения

1. He could well have missed the bus.
2. In this time of year I never go anywhere without an umbrella in case it rains.
3. We don't necessarily want to redecorate the whole flat just because the bedrooms look a bit shabby.
4. I finally came to terms that we were no longer friends.
5. I don't feel that I like the design, let's start from scratch.
(Последнее предложение не вписывается в лимиты трех-шести слов)
Как вариант, последнее предложение может быть I don't feel it is adequate; start from scratch.