18、I arrived only ______ that the others had already left．

A．finding           B．to find           C．having found           D．found

17、Tom is not ______ he thinks he is!

A．as clever as half       B．as half clever as       C．half as clever as       D．half clever than

16、I’ve had enough of your bad manners．Will you please ______!

A．behave           B．perform         C．act           D．present

15、— Do you want tea or coffee?

— I don’t mind, ______ one you’re making．

A．however          B．whenever        C．whichever       D．whatever

14、This unfair system once prohibited ______ blacks from sitting where we liked on buses．

A．our                  B．we                  C．ours                D．us

13、Realizing that her husband had deceived her, she demanded that she ______ the whole truth．

A．should tell         B．told         C．be told        D．was told

12、Under no circumstances ______ allowed to enter the lab without permission．

A．you are         B．you will be           C．are you         D．have you

11、What’s the use of keeping the secret ______ everyone has already known it?

A．as though         B．now that          C．before long          D．in case

10、Jim couldn’t afford to buy the present for his wife, for five pounds was ______ he had on him．

A．all that             B．that         C．all what          D．what that

9、— How could you make such a silly mistake?

— I’m sorry．I ______ it before I handed in the paper．

A．should check                                              B．could check

C．must have checked                                           D．ought to have checked