The river widens considerably as it begins to turn east.
A. extends
B. stretches
C. broadens
D. travels
We were shocked to find that Mary did't know her guest's name.
A. frustrated
B. disturbed
C. relieved
D. surprised
The leading astronomers of the sixteenth and seventeenth centries were fascinated by comets.
A. intrigued
B. infected
C. inconvenienced
D. inclined
I have got to abide by the rules.
A. stick to
B. persist in
C. safeguard
D. apply
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