You will fall behind others you work hard.
A. If
B. unless
C. though
D. since
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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
The Bund looks beautiful at night that it attracts a lot of tourists every day.
A. very
B. so
C. such
D. quite
You will lose the ability to pay attention, plan and stay active after one or two nights you can sleep well.
A. until
B. when
C. unless
D. if