tā / jì / rán / dā / ying / wán / chéng / zhè / ge / xiàng / mù / jiù / yí / dìng / huì / shàn / shǐ / shàn / zhōng

他既然答应完成这个项目，就一定会善始善终。

Since he promised to complete the project, he will surely see it through.