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
His parents insisted that he __________English well when he was in junior school.
A. would learn B.must learn
C. learned D. learn
I don’t like this new model of App6 +; _________I had enough money, I wouldn’t buy it.
A. only if B. even if
C. as if D. if only
