The country's railway system has launched online ticket-booking and a real-name ticket purchasing system, and _______ requires passengers to provide their ID numbers when buying tickets.
| A．which | B．that | C．what | D．this |
--Where is Xiao Wang? --I don't know. He__________ be in the library.
| A．can | B．must | C．might | D．may |
Bread and butter____________ for breakfast in many Chinese homes nowadays.
| A．serve | B．servers | C．is served | D．are served |
Is this the restaurant ___________ ?
| A．which you work | B．in which you work |
| C．for which you work | D．where you work in |
—Will you go fishing with me?
—___________.
| A．No, I'll be very busy | B．Yes, I'll be glad |
| C．Certainly, I'll be sorry | D．Certainly, I'll be glad to |
____the sketch of Xiao Shenyang made a _____has been known to us all.
| A．That; hit | B．What; strike | C．Why; beat | D．which; knock |