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Hoàn thành rồi giải thích giúp mình the following sentences
1/ Fish have nostrils____ are used for smelling not for breathing as many people would believe.A.they
B.what
C.whom
D.that
2/ Farm supply crops with phosphorous in areas _______ have removed it from the soil.
A. because long years of cultivation
B. where long years of cultivation
C. with long years of cultivation
D. by long years of cultivation
3/ The environment (A) is frustrated at many activities of (B) human beings (C) who irresponsibility is causing (D) great damage to their surrounding.
4/ Car ______ is the main reason for the city's pollution.
A. exhaust B. rubbish C. garbage D. dump
5/ THe dam ______ back the water suddenly gave way
A. holding B. to holding C. hold D. being hold
6/ The shot ______ that day signaled the start of the American Revolution
A. firing B. when fired C. fired D. to fired