20．- Would you take this along to the office for me?

　 　 - ________.

　 　 A．With pleasure　　　 B．That’s right　　　　　 C．Never mind　　　　 D．Don’t mention it

19．When I was waiting for an important call, my cell phone ________ run out of power.

　 A．can　　　　　　　　　　 B．may　　　　　　　　　　 C．must　　　　　　　　　 D．shall

18．It’s amazing that Mike should get such good marks while he does only ________ the others.

　 　 A．as much as half　　 B．half as much as　　 C．as many as half　　 D．half as many as