考查情态动词的用法。句意为：你什么意思，只有10张票吗？应该是12张。should表示可能性推测，意为“应该”，符合句意。would表示过去将来；will表示意愿；shall表示一种语气，均不合句意。

Listen! There’s a lot of noise from next door. They _____________ a party.

A. could have had                        B. must be having            

C. should have had                           D. can be having

I could have called you for help, but I ____ your number.  

  A. couldn’t remember          B. didn’t remember

  C. should have remembered     D. hadn’t remembered

-- Why didn’t you go to Mike’s birthday party yesterday?

-- Well, I _____, but I forgot it.

A．should            B．would            C．should have        D．must have

It’s high time that we _____ home and _____ supper now.

A. go…have     B. went…had  C. go…should have   D. went…to have