政府承诺会按时履行环保责任。Zhèngfǔ chéngnuò huì ànshí lǚxíng huánbǎo zérèn.The government promised to fulfil its environmental responsibilities on time.
签了合同就要履行,不能想改就改。Qiān le hétong jiù yào lǚxíng, bù néng xiǎng gǎi jiù gǎi.Once you have signed a contract you must fulfil it; you cannot change it whenever you like.
他履行了自己的诺言,每天都陪孩子读书。Tā lǚxíng le zìjǐ de nuòyán, měitiān dōu péi háizi dúshū.He kept his promise and read with the child every day.