Once he makes a promise he will it.A. insist onB. carry outC. keepD. stick to

问题补充：

Once he makes a promise, he will it.

A. insist on

B. carry out

C. keep

D. stick to

答案：

A. insist on

B. carry out

C. keep

(答案→)D. stick to

解析：stick to表示坚持原则、立场和承诺等；insist on意思是坚持看法、观点等。