16.According to Mr. Green, this is a _______ problem.
A. grand B.complicated C.owing D.powder
17.I’m going to call a _______ to repair my car this afternoon.
A. mechanic B.host C.giant D.glance
18.They have already _______ the telephone in their new home
A. parceled B.spun C.installed D.retained
19.The roof has _______ in it, and the front steps need to be fixed.
A. ants B.drums C.grains D.leaks
20.He received four years of training in English and two years in English teaching.He is a _______ English instructor.
A. responsible B.scared C.vast D.qualified
16.B 17.A 18.C 19.D 20.D