At school, some students are active, ______ some are shy, yet they can be good friends with one another.
A. while B. although C. since D. thus
___________ seems hard to believe is that the bird the officer uses is the same bird often seen in public parks----the pigeons.
A. What B. Whatever
C. Which D. That
I’d appreciate _______ if you could let me know in advance whether you will come or not.
A. it B. you C. one D. what
It was after he had read the requirements _______ Mr. Black realized the task was too difficult to be finished.
A. when B. that C. which D. what
The last bus _________ two minutes before I arrived at the bus stop. What a pity!
A. left B. has left
C. was leaving D. had left
A new subway ________ in Changsha and it will be open to traffic when completed next year.
A. has built B. has been built
C. is building D. is being built
