. People should send their complaints to the head office.

A.Complaints should be send to the head office by people.

B.Complaints should be sent to the head office.

C.Their complaints should send to the head office by people.

D.Their complaints to the head office should be sent.

They cancelled all flights because of fog.

A.All flights was cancelled by them because of fog.

B.All flights because of fog were cancelled.

C.All flights were because of fog cancelled.

D.All flights were cancelled because of fog.