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。
Heboughtahouseforhischildren________
Thechallengeisnotoneofexpansion._______,therapidgrowthinenrollmentoverthelast40yearshascometoanend.
_______atallisworthdoingwell.
Thewoundedsoldierswouldrecoverquicklyiftheywerewell________.
Sofarscientistshaveonlyacquired________understandingofthephysicalprocessesthatcauseearthquakes.
