Complete the sentences with the correct passive form of the verbs.

1) In my opinion more research into the new pills ought to / to do before people started buying them.
2) Their sleep can / to disturb by any noise.
3) I really doubt that wild animals can / to hold in the zoos safely.
4) It is evident that the results of the exams must / to check before they were revealed.
5) Some doctors have an opinion that not all health myths should / to dismiss completely.
6) Do you think most smokers could / to encourage to stop smoking by using medicine?
7) They might / to lie to by the food industry for a long time about healthy products they need.
8) Some modern fashion styles may / to misunderstand in the past/

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