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Nuclear weapons _____ a threat to everyone now.

A. are posing

B. are illuminating

C. are reducing

D. are eliminating

If she ……………… to Greenland, she ……………… some igloos.

A. Had been, would have seen
B. Had been, had seen
C. Would have been, had seen

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