1. Exercise is__________ as any other to lose unwanted weight.

A. so useful a way               B. as a useful way

C. as useful a way               D. such a useful way

2. —Why didn't you answer my phone when I phoned you at about 11 p. m. yesterday?

—I ___________and failed to hear the phone.

A. might have slept                B. must be sleeping

C. might be sleeping              D. must have been sleeping

3. His parents meant him_____________ scientific research, but he showed no interest and turned poet.

A. going in for                     B. to have gone in for    

C. to go in for                     D. having gone in for