A.\({n_d} < {n_t} < {n_c}\).B.\({n_d} < {n_c} < {n_t}\).C.\({n_t} < {n_c} < {n_d}\).D.\({n_t} < {n_d} < {n

A.50π Hz.
B.100π Hz.
C.100 Hz.
D.50 Hz.

A.sector
B.desert
C.willing
D.diverse

A.immense
B.full
C.spacious
D.huge

A.monotonous
B.demanding
C.boring
D.fascinating

A.ingredient
B.optimistic
C.traditional
D.significant

A.I am not sure whether Nancy was at home last night or not.
B.No one knows whether Nancy was at home last night.
C.Nancy should have been at home last night.
D.Nancy must have been at home last night.

A.I have difficult in sleeping in a filthy place like this.
B.I can't possibly sleep in a filthy place like this.
C.I find it possible to have a good sleep in the quiet place.
D.I have difficulty to sleep in such a filthy place like this.

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