1) ______ Verbal Behavior (1957) 2) __

问题：

1) ______ Verbal Behavior (1957)
2) ______ Notional Syllabuses (1976)
3) ______ The Principles of Language Study (1921)
4) ______ Guide to Patterns and Usage in English (1954)
5) ______ The Natural Approach: Language Acquisition in the Classroom
a) Harold Palmer
b) Tracy Terrell
c) B. F. Skinner
d) A. S. Hornby
e) D. A. Wilkins