Change into passive voice.
8. Drunk drinks cause lots of accidents in this city.
................................................................................
9 How many languages do they speak in Canada?
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Change into passive voice.
8. Drunk drinks cause lots of accidents in this city.
=> Lots of accidents in this city are caused by drunk drinks.
9 How many languages do they speak in Canada?
=> How many languages are spoken in Canada?
Change into passive voice:
8. Lots of accidents are caused in this city by drunk drivers.
9. How many languages are spoken in Canada?