59.　 The car continued driving ____________(向东).

58.　 The ship spent four days in ____________(港口).

57.　 This colour is ____________(稍稍) different from that one.

56.　 The river lies on the ____________(边界) between the US and Mexico.

55.　 Kim worked as a t____________ guide in Dalian las summer.

54.　 I’m e____________ sorry to have troubled you.

53.　 A shark can smell blood at a d____________ of half a kilometre.

52.　 He left as a poor boy and returned as a w_________ man.

51.　 Don’t speak any more. Everybody ____　 _____　 ____(厌倦了) your everlasting complaints!

50.　 We have an extractor fan in the kitchen to _____　 ____　 _____(除掉) the smell of cooking.