They believe that burning fossil fuels is the main cause of air pollution.
A.
B.Burning fossil fuels is believed to result from air pollution.
C.Burning fossil fuels is believed to have caused high levels of air pollution.
D.It is believed that air pollution is mainly to blame to burning fossil fuels.

I advise you to send her a postcard.
A.Her postcard should be sent to you.
B.You’d rather I sent her a postcard.
C.You’d better send her a postcard.
D.I am advised to send you her postcard.

Our teachers have explained the English grammar.
A.The English grammar have been explained by our teachers.
B.The English grammar has explained to our teachers.
C.The English grammar has been explained by our teachers.
D.The English grammar have explained by our teachers.

People warned us not to go out alone.
A.
B.We were warned not to go out alone by people.
C.We were warned not to go out alone.
D.We weren't warned to go out alone.

Many people criticized me yesterday. I objected to this.
A.
B.I objected to many people being criticized yesterday.
C.I did not approve of many people criticized yesterday.
D.I objected to being criticized by many people yesterday.

She will have a veterinary surgeon examine her dog.
A.She will have her dog examined by a veterinary surgeon.
B.She will been had her dog examined by a veterinary surgeon.
C.Her dog will have a veterinary surgeon to examine.
D.A veterinary surgeon will have been examined her dog.

She last had her eyes tested five months before.
A.She had tested her eyes five months before.
B.She had not tested her eyes for five months then.
C.She hasn’t had her eyes tested for five months.
D.She didn’t have any test on his eyes in five months.

I didn't realize that somebody was recording our conversation.
A.Our conversation wasn't realized to be recorded.
B.I didn't realize that our conversation was being recorded by someone.
C.I didn’t realize that our conversation was recorded.
D.I didn't realize that our conversation was being recorded.

The judge was being escorted from the court by strong police guards.
A.Strong police guards were escorting the judge at the court.
B.Strong police guards were escorting the judge into the court.
C.Strong police guards were escorting the judge from the court.
D.Strong police guards were escorting the judge towards the court.

The airport taxes are included in the ticket price.
A.You need to pay for ticket and airport taxes.
B.The ticket is included in the airport taxes.
C.The ticket price covers the airport taxes.
D.The airport taxes and ticket price should be paid separately.