Замените следующие действительные
обороты страдательными:
1. I must do it at once.
2. You can use this material for your work.
3. I can't send off the letter today.
4. We couldn't finish the work in time.
5. You may leave the dictionaries on the table.
6. We have to do this work every day.
7. They had to put the goods on deck.
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