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
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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
Pandas are facing danger! The situation won't change humans stop killing.
A. unless
B. though
C. if
D. after
-- Can't I park my car free here?-- You can, for four hours, you spend over 100 yuan in this supermarket.
A. though
B. if
C. unless