-- I see Bob, he's always listening to music. Yeah, he's crazy about it.
A. Whenever
B. Although
C. Since
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-- Have you improved your spoken English? Not yet. I'll try my best I am not good at it now.
A. so
B. although
C. but
D. until
You will fall behind others you work hard.
A. If
B. unless
C. though
D. since
We will go to Tian'anmen Square to watch the raising of national flag if it tomorrow.
A. will rain
B. rains
C. doesn't rain
D. won't rain
Mrs. Smith explained the problem clearly all of us could understand her.
A. until
B. although
C. so that
D. as soon as