题目内容

__________ a foreign language is not an easy thing.

A. To master
B. Master

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The most important thing is _________ theory into practice.

A. put
B. to put

It’s difficult for us __________ the work within two hours.

A. to finish
B. finishing

__________ is easier than doing.

A. Saying
B. to say

I'm against __________ him to dinner.

A. invite
B. inviting