16.I prefer a _______ typewriter to an automatic one. $ ^; W }' v$ J! Z. H' g# D; M7 e6 _. ]# F
A. mechanic B.manual C.merchant D.mental % F; o# v7 J, B " o0 O2 @4 }9 D; x+ ?17.If you want to stop for a moment, just press the ‘_______’ button on your tape recorder.. Y7 T. B4 b6 c$ z
6 a; @( N9 I F0 PA. toilet B.thumb C.violin D.pause, J. Z4 Z% K8 }; G% e
9 k5 {! w7 H& ^) v20.I have _______ three terrible English examinations this week. & p& ? ^ f2 I" z% b5 v 5 A/ J6 \4 Z: qA. observed B.operated C.undergone D.suffered$ x/ ^* a h6 ~/ l5 ]# Q( s- v
16.B 17.D 18.D 19.A 20.C