a few SC questions, help and thank you

gina2012

Researchers agreed that the study of new treatments for heart attack patients was extremely important but more research was needed to determine that balloon angioplasty preceded with ultrasound was or was not any better for heart attack patients than the balloon procedure by itself.



A.more research was needed to determine that balloon angioplasty preceded with ultrasound was or was not any better for heart attack patients than

B.more research was needed for determining whether or not balloon angioplasty preceded by ultrasound is any better for heart attack patients than is

C.that more research was needed to determine whether balloon angioplasty preceded by ultrasound is any better for heart attack patients than

D.that more research was needed to determine that balloon angioplasty preceded with ultrasound was any better for heart attack patients than

E.that more research was needed for determining that balloon angioplasty preceded by ultrasound is or is not any better for heart attack patients than is



I got offical answer C

I choose B, i do not understand because i think but that is awkward

gina2012

When a ton of wheat was being moved from Buffalo to New York City before the opening of the Erie Canal in 1825, it took three weeks and cost $100, but when the canal was used, it took less than eight days and cost less than $6.

A.    When a ton of wheat was being moved from Buffalo to New York City before the opening of the Erie Canal in 1825, it took three weeks and cost $100, but when the canal was used, it
B.    Moving a ton of wheat from Buffalo to New York City before the opening of the Erie Canal in 1825, it took three weeks and cost $100; using the canal, it
C.    Before the opening of the Erie Canal in 1825, moving a ton of wheat from Buffalo to New York City took three weeks and cost $100; on the canal the move
D.    In 1825, before opening the Erie Canal, to move a ton of wheat took three weeks from Buffalo to New York City, which cost $100; moving it on the canal
E.    To move a ton of wheat in 1825 from Buffalo to New York City took three weeks before the opening of the Erie Canal, costing $100, but in using the canal, the move


the answer is C

I found on the canal is strange. I chose B

gina2012

Caribou are wary animals with excellent hearing, so stalking them over the treeless landscape, getting close enough to kill it with nothing but a handheld lance, as Dorset people did, required exceptional hunting skill.

A.    so stalking them over the treeless landscape, getting close enough to kill it
B.    so to stalk them over the treeless landscape and get close enough to kill one
C.    so in order to stalk them over the treeless landscape and get close enough to kill one
D.    and so in order to stalk it over the treeless landscape, getting close enough to kill it
E.    and so stalking them over the treeless landscape and getting close enough in order to kill it


I understand the answer is B

however, can we use  'to do sth requires sth'?

doing sth requires sth is better?