Переведите следующие предложения в пассив: 1. they investigated the crime carefully. 2. her friend gave her this nice present. 3. my brother has never driven such a big car before. 4. she wrote a nice letter to her friend. 5. we had translated this difficult text before we came to the institute. 6. they visited spain twice last year.

1. The crime was carefully investigated.
2. This nice present was given to her by her friend.
3. Such a big car has never been driven by my brother before.
4. A nice letter was written by her to her friend.
5. This difficult text had been translated by us before we came to the institute.
6. Spain was visited by them twice last year.