D. though
23. Watch your step, ______ you might fall into the water.
A. or
B. and
C. unless
D. but
24. He came to the party, ______ he hadn’t been invited.
A. in case
B. in spite of
C. even
D. although
25. ______ hearing the good news, they jumped with joy.
A. For
B. To
C. On
D. At
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