About 10 million dolphins are said ________ in the past 15 years.
A. to have killed B. to kill
C. to have been killed D. to be killed
--- I wonder ________ Mary has changed so much.
--- She has been suffering a serious disease.
A. why B. what C. when D. where
The masterpiece “Guernica”, ________ by Picasso, is permanently exhibited in Madrid.
A. paint B. painted C. painting D. to paint
After Jack ________ some e-mails, he started working on his report.
A. sends B. has sent C. had sent D. would sent
You’d better write down her address before you ________ it.
A. forget B. are forgetting
C. forgot D. will forget
If we had phoned the rescue service in time, we ________ on the motorway right now.
A. weren’t trapped
B. wouldn’t be trapped
C. hadn’t been trapped
D. wouldn’t have been trapped
