Uzupełnij zdania poprawną formą słów z nawiasów. 

1. Children tend to be ................... (ENVY) of other children's toys.
2. You're as ................... (TRUST) and naive as a baby.
3. Reading books can influence your intellectual ........... (DEVELOP) in a proper way.
4. He's so ................... (SELF).
5. This jewel is of ..................... (PRICE) value and so it will never be sold to anyone.
6. Mr and Mrs Lee got divorced after they realised their ................... (MARRY) wasn't working.
7. An ...................... (EXTEND) investigation is being carried out to explain the mysterious disappearance of the artefacts.