参考答案：1.pedagogy 2.communication 3.language 4.Applied linguistics 5.social factors 6.indirectly 7.economic 8.different 9.methods 10.principles 11.functional

12 structural 13.SVO 14.descriptive 15.Syntax 16.external 17.habit formation 18.behavior 19.interplay 20.universal grammar 21.topic 22.one thing at a time

23.communicate 24.use 25.connotation or affective meaning 26.Register 27.hyponyms 28.spelling 29.structure 30.product 31.language use 32.skill

33.correspondence,or:relationship 34.Sound 35.Intonation 36.structure

37.the grammar-translation method 38.approach 39.method 40.overgeneralization