Attention, please! All the mobile phones must _____ before the meeting starts. [ ]

A. turn off

B. be turned off

C. be turning off

— Wow! Jerry got full marks again! How lucky he is!

— Not exactly! _____. He makes full use of his time to study.[ ]

A. He is more lucky than hardworking

B. He is not so much lucky as hardworking

C. He is far less hard working than lucky

D. His classmates are no more hard working than he