Uzupełnij słowa odpowiednimi końcówkami, tak aby utworzyć przymiotniki.

What's the most ............... (effect) way of losing weight?
My father has a very ............ (stress) job, so he often has headaches.
Tom spent a few ............ (sleep) nights by his mum's bed in hospital.
Don hates injections. He says they are always very ............. (pain).