Поставьте глагол-сказуемое в следующих предложениях в страдательном залоге, стараясь сохранить время.
1. ? hid the treasure in a place which no one could find.
2. ? can't learn a foreign language in a few days.
3. The dog was mad and ? had to shoot it.

1. The treasure was hidden in a place which no one could find. 2. A foreign language can't be learnt a few days. 3. The dog was mad and it had to be shot.