Упр.4 Тест Unit 3 Рабочая тетрадь ГДЗ English Михеева 9 класс

Fill in the gaps with invent or discover and their derivatives in proper forms.

1) We soon discovered we had been mistaken.
2) Who invented computers?
3) It was difficult to discover the truth.
4) That was the biggest archaeological discovery in Norway for fifty years.
5) He failed to patent his invention and never got a penny for it.
6) Someone who has invented something is called an inventor.