[ Relative Clauses ]
The teacher _____ we respect is retiring.
A. whom
B. who
C. whose
D. that

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General Knowledge › ViewWhat gas do we need to breathe to stay alive?
A. Nitrogen
B. Carbon Dioxide
C. Oxygen
D. Argon
E. Sulphur dioxide
Present Tense › View
I ______ for you since two o’clock.
A. have waited
B. am waiting
C. wait
D. have been waiting