They love their daughter so much that they are always ready to do everything they can ________ her happiness.

A．to make sure of

B．make sure of

C．be sure of

D．to be sure of

某建设工程当事人双方签订了施工总承包合同，在合同中约定用于该工程的永久设备由发包人提供，则该约定应写入（）中。

A．工程概况

B．中标通知书

C．合同通用条款

D．工程承包范围