It is no use () to learn a language just by studying a dictionary.

单项选择题Doing your homework is a sure way to improve your test scores, and this is especially true () it comes to classroom tests.

A. when
B. while
C. as
D. after

单项选择题Mr. Smith left for London this morning. I had thought he () until next Monday.

A. isn’t going
B. wasn’t going
C. won’t going
D. hasn’t gone