21. —The kids are quiet, aren’t they?

 —Yes. They have already got used _______at meals.

A. not to talk                 B. to not talking

C. to talk                       D. to talking

22. According to a spot check ______on 110 fowl enterprises from five provinces, one fifth of the products were found not to ________state requirements.

A. to conduct; meet          B. conducted; meet

C. conducted; take           D. conducting; take