______ I had discovered Panshan earlier, why should I have traveled so far afield to the south of the Yangtze River.
A. But
B. Although
C. If
D. That
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Li Meng passed his mother his cup ______ asked for some more tea.
A. but
B. or
C. and
D. if
Study harder, ______ you will fall behind others.
A. and
B. or
C. but
D. so
The doctors are very tired, _______ they are still working very hard.
A. but
B. if
C. only
D. when
______ you come back, please let me know.
A. Later
B. Until
C. As
D. As soon as
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