문법문젠데요~
 To summarize an article is to separate __________ which is essential from the supporting material that surrounds it.

정답은 that 인데요 문법적 구조를 잘 모르겠어요~

She insists it is (I) who (am) mistaken about the effect of the order on those who have (less) responsibilities than (I).

답은 less를 fewer로 고치는 건데 I who am 부분 좀 설명해주세요^^

In  (ancient) times, books came in cumbersome packages and could not (be carried) under (an) arm or read (on way) to work.

정답은 4번인데 왜그런지 설명좀 해주세요~~^^