Itisobvioushowbadmovieswillimpact________children.
A、onA
impact 有时也可以当作一个动词来用，与之搭配的介词仍然是 on。句意：坏电影对儿童会产生什么影响是显而易见的。
He declined _______ more about it.
Importswillbeallowedinproportion_______exports.
TheFrenchmaintaina________separationofpersonalandprofessionallife.
Thechallengeisnotoneofexpansion._______,therapidgrowthinenrollmentoverthelast40yearshascometoanend.
You’dbetterleavethings________ifyoudon’tknowhowtodealwiththem
