Chuyển sang câu bị động:
9.The shop assistant handed these boxes to the customer.
10.The board awarded the first prize to the reporter.
11.Have you sent the Christmas cards to your family?
12.The committee appointed Alice secretary for the meeting.
13.He hides the broken cup in the drawer.
14.They keep this room tidy all the time.
P/s: Too easy. Right?????