b Use the words from Ex. 4a in the correct form to complete the sentences 1–5.
1 His ............ in sailing was proven to be the cause of the accident.
2 You'll have to come and see my flat. I've just ............ it.
3 Large grey clouds suddenly ............ the sky above us.
4 This is such an excellent meal! It's cooked to ............ !
5 It wasn't his ............, but he caused a lot of trouble.
