1) Amajority - 55 percent - rate members of the U.s. House of Representatives low for honesty.
이 문장에서 주어가 A majority 이고 동사가 rate인 것 같은데 a majority를 복수로 받나요??

2) This prevailing mood of distrust is understandable given how commonplace it has become
for so many in public life to lie to us.
밑줄 친 부분부터 문장이 어떻게 구성이 되어 있는지 모르겠어요 ㅠ

3) Gongress is frenetically trying to pass medical care reform that report after report shows is filled with
politically manipulated data and conclusions.

밑줄 친 부분 설명 부탁드려요~ 이해가 안 가네요ㅠ