Change the sentences into the passive

Mọi người giúp em bài này với nhé 
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VI. Change the sentences into the passive
1. They used to copy books by hand in the days when they hadn't invented printing.
2. The bank manager kept me waiting for half an hour.
3. They have to change the timetable, don't they?
4. They wanted to catch the criminals at once.
5. What would happen if I lost these documents?
6. You'll have to see it to believe it.