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. ? cant 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 cant be learnt a few days.
3. The dog was mad and it had to be shot.