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Not a sound ____ (hear) before he arrived here.

A. had been heard

B. had been hear

C. had heard

Elephants

A. A
B. An
C. Plural noun

In 21st century, scientists continue to look for new ways _____ serious disease and slow down the ageing process

A. to treat

B. treat

C. treatment

D. treated

a system of ideas to explain something

A. servant

B. evaluate

C. theory

D. preserve