Is this the reason at the meeting for his carelessness in his work?
A. he explained B. what he explained
C. how he explained D. why he explained
It’s freezing outside. You ______put on your coat.
A. had better to B. had better C. would rather D. would better to
Jack asked his brother Betty.
A. did he know B. if he knows C. does he know D. whether he knew
I have heard from my father, is in American.
A. which B. that C. from whom D. who
Swan Lake is a famous ballet(芭蕾) in four acts, ________ on a German fairy tale.
A. basing B. based C. bases D. to base
He had no idea of how the climb would be _______ he was half way up the mountain.
A. when B. until C. while D. as
