–Why do you look so upset?
–The electricity was cut off suddenly and my essay _______ unfinished since.
A. was leftB. has leftC. leftD. has been left
– It is said that Frank is very rich and is always changing his private cars .What is he?
–_______ of a manager, I am not sure.
A. Somebody B. Anyone C. Something 
D. Anything
Among so many people at the party, I _______ John, one of my classmates after 20 years.
A. looked up B. picked out C. took up D. brought out
He was about to leave the office for home _______someone knocked the door and asked for some help.
A. untilB. whileC. asD. when
There are nearly one hundred foreign students in our university, most of _______ are from America and Australia.
A. whichB. themC. whomD. those
Working hard in study is important, but_______ as important is the desire to learn.
A. merelyB. equallyC. nearlyD. partly
