Change the sentences into the passive voice.
1. they speak english and french in canada.
2. tom showed his friends his collection of stamps,
3. the doctor prescribed her some medicine for cough.
4. they build a lot of houses every year.
5. j. cook made his round-the-world voyage in 1768.
6. they always give me useful advice.
English and French are spoken in Canada by them.
The collection of stamps was showed his friends by Tom.
Some medicine for cough was prescribed her by the doctor.
A lot of houses are built every year by them.
The round-the-world voyage was made in 1768 by J. Cook.
An useful advice is always given me by them.