Heboughtahouseforhischildren________
A、livedinB
本题属于动词不定式复合结构做后置定语。 in 不可省略。句意：他买了一套房子给孩子们住。
名词解释：preferredstock
So far scientists have only acquired ________ understanding of the physical processes that cause earthquakes.
Therearemanysalesthisseason,duringwhichstoreswilllowertheir_______prices.
They built a highway _______ the mountains.
Thetrafficwasheldupformorethanthirtyminutes,________causedmetoarrivelate.
