单项选择题

It is easy to read Sam because he （） squints when he finds himself in an uncomfortable situation.

A.habitually
B.habitual
C.habits
D.habit

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单项选择题

Our staff prefers to fly than to use other modes of transportation since it is much more （）.

A.optional
B.protective
C.excessive
D.convenient

单项选择题

Some of our clients have complained that the time it takes to get a （） from a service representative is enough to make them not want to use our services again.

A.response
B.responding
C.responded
D.respond

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