单项选择题

By the first decade of the 21st century, international commercial air traffic is expected ______. vastly beyond today’s levels.

A. to have extended

B. being extended
C. to be extending

D. having been extended

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单项选择题

Tom was glad that his success would ______ for those who would follow.

A. be easier

B. be easier to make
C. make it easier

D. make things easier

单项选择题

There are few electronic applications ______ to raise fears regarding future employment opportunities than robots.

A. likely
B. more likely
C. most likely
D. much likely

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