69.　　 strong a. – strength n. 　　

[s]deep a. – depth n.　 　warm a. – warmth n.　 long a. – length n.　 wide a. – width n.

68.　　 serve v. – servant n. – service n.

67.　　 securely ad. – secure a./v. – security n

66.　　 Satisfied a. – satisfying a. = satisfactory a. – satisfaction n. – satisfy v.

65.　　 safe n. – safety n. – safe a. – safely ad.

64.　　 rob v. – robbery n. – robber n.

63.　　 relax v. – relaxation n. –relaxing a.

62.　　 realize v. – realization n.

61.　　 question n. – question v.

60.　　 prove v. – proof n. U　 证据 　c.f. clue 线索