Find ways to praise your children often you'll find they will open their hearts to you.A

问题补充：

Find ways to praise your children often, youll find they will open their hearts to you.

A. till

B. or

C. and

D. But

答案：

A. till

B. or

(答案→)C. and

D. But

解析：考查固定句型。祈使句+and/or，相当于if引导的条件状语从句；句意：找方法经常表扬孩子，这样，见你就会发现他们会向你敞开心扉。根据句意可知，表递进，用and。故选C。