17, The Greens had their carpet cleaned by a carpet cleaner.
(cấu trúc bị động khi ai đó làm gì cho ta: have/get s.t done)
18, It's believed that he has special knowledge which may be useful to the police.
19, The footballer is supposed to be earning ten million pounds a year.
20, It was unreasonable of the students to complain about the exam results.