Переделайте из эктива в пэссив либо наоборот

3. The virus writer hasn't been arrested (by them) yet.

4. A lot can be done (by us) to slow down global warming.

5. A number of men are being questioned (by the police).

6. Bananas are grown (by them) in Caribbean.

7. This medicine must be taken (by you) twice a day.