Directions: The following words in the box can be used both as nouns and verbs. Complete the following sentences with an appropriate word from the box. Change the form if necessary. trouble wonder cause guard sacrifice encounter conflict dread 1) If you can't pay the bill, you are going to be in _______. 2) His parents made a lot of _______to make sure he got a good education. 3) He managed to get past two prison _______and escape. 4) Her _______of being home alone made her extremely nervous. 5) This meeting will be the first _______between the party leaders since the election. 6) Can I _______you to close the door? 7) Will this deadline ( 截止日期 ) for finishing the work _______you any problems? 8) He _______a promising career to look after his children. 9) I haven't seen Jim in years. I _______what he looks like now. 10) She has been the _______of all my troubles. 11) It is a _______that he is still alive after such a bad accident. 12) The results of the new research seem to _______with existing theories. 13) Before they had gone very far, they _______a woman selling flowers. 14) He's _______his driving test—he's sure he's going to fail. 15) There is no one to _______the isolated ( 偏僻 ) farms against possible attack. 16) Nations must not settle their differences by armed _______.