It was the third time that she ______to this mountain village to see the children.
A. has come B. had come
C. came D. would come
I can well remember that there was a time _____I played sports with my close friends in junior school.
A. what B. which C. that D. when
While _________the topic of music in class, all the students show great interest in it.
A. discussed B. discuss
C. discussing D. are discussing
Please wait a minute, honey! I _______ my work.
A. have finished B. am finishing
C. finished D. finish
Great changes _________ in many fields since China was open to the whole world.
A. have taken place B. took place
C. have been taken place D. were taking place
_____you’ve made a promise, you are expected to carry it out.
A. While B. Unless
C. Once D. Though
