A.tongueB.mouthC.lipsD.words
A. tongue
B. mouth
C. lips
D. words
A.studyB.imitateC.simulateD.learn
A. study
B. imitate
C. simulate
D. learn
A.seldomB.muchC.frequentlyD.irregularly
A. seldom
B. much
C. frequently
D. irregularly
A.makeB.concernC.useD.exclude
A. make
B. concern
C. use
D. exclude