[ Vocabulary and Grammar ]
she has been waiting for us _____ 3 hours.
A. for
B. in
C. of
D. since
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Grammar › View____ a lovely smile you have!
A. How
B. What
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Sarah Frances Whiting opened the —- of physics in the United States in 1878.
A. undergraduate teaching was in a second laboratory
B. second teaching laboratory of undergraduate
C. undergraduate teaching laboratory was second
D. second undergraduate teaching laboratory
Grammar › ViewWhich word is spelled incorrectly?
It is ilegal to use certain types of fireworks in many states.
A. certain
B. ilegal
C. states
D. correct
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This is a rare opportunity_______ you should take advantage to get a better jo
A. to which
B. for which
C. of which
D. on which