12.A.independently B.repeatedly C.logically D.generally
11.A.enable B.stimulate C.advocate D.prevent
10.A.Because B.Though C.Whether D.If
9.A.effective B.passive C.relative D.expressive
8.A.prevent B.require C.assist D.forbid
7.A.teachers B.classmates C.partners D.students
6.A.what B.those C.as D.which
5.A.without B.with C.on D.except
4.A.suspects B.understands C.wonders vinces
3.A.assignments B.information tent D.definition