Mrs. Smith explained the problem clearly all of us could understand her.
A. until
B. although
C. so that
D. as soon as
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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
The bell rang the teacher was explaining the experiment to the students.
A. until
B. before
C. while
D. after
Now most families have only one child our country's one-child policy.
A. so
B. because
C. because for
D. because of