11、 __________ was unimportant．
A．Whether he enjoyed our dinner or not
B．No matter how he enjoyed our dinner
C．If he enjoyed our dinner
D．What he enjoyed our dinner


12、 He tested the__________of the knife with one finger．
A．border
B．frontier
C．edge
D．margin


13、 She__________ her trip to Singapore because she was ill．
A．called off
B．closed down
C．put up
D．went off


14、 Do you know why John didn’t__________ at the party yesterday evening?
A．show off
B．show down
C．show up
D．show fn


15、 She has done nothing that directly__________ with the actions of the others．
A．interrupted
B．influenced
C．interfered
D．affected


16、 Customs__________are paid on goods entering the country．
A．duties
B．responsibility
C．fees
D．charges


17、 It’s desired that she__________ to teach US at least twice a week．
A．comes
B．will come
C．come
D．may come


18、 What a lovely party!It’S worth__________ all my life．
A．remembering
B．to remember
C．to be remembered
D．being remembered


19、 New scientific discoveries constantly__________us．
A．amuse
B．surprise
C．amaze
D．astonish


20、 You should have been more patient__________ that customer；I'm sure that selling him the watch was a possibility．
A．of
B．with
C．for
D．at