单项选择题

The purpose of this system is ______ trade flow as freely as possible, making sure that there are no undesirable side-effects.

(A) help
(B) to help
(C) helping
(D) in helping
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单项选择题
The CEO is now faced with a decision whether to downsize the ______ current operations or lay off 500 employees.
(A) addition
(B) an addition of
(C) an additional
(D) in addition
单项选择题
Weather ______, the morning activity will be a hike in the mountains or, for those who are interested in fine art, a visit to the museum.
(A) permit
(B) permitted
(C) permits
(D) permitting
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