He insists on us ________ him respect.
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I don't want anyone _______ me.
A. bother
B. to bother
__________ a foreign language is not an easy thing.
A. To master
B. Master
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