SAT grammar questions

guac98
Thu, 08 Jan 2015 02:51:56 +0000

Hey guys, can someone help me with the following grammar questions?

Students in the origami class selected colorful sheets of paper, creased and folded it carefully, and thus had created fanciful animal shapes.
A. creased and folded it carefully, and thus had created
B. then creased and folded them carefully to create
C. they creased and folded it carefully to create
D. creasing and folding it carefully to create
E. creased and folded them carefully, thus they created
I don’t really understand why B is right since I thought that “then” could not be used as a conjunction?

Aloe vera is a succulent plant from whose leaves are extracted a gel that has been prized since ancient times for its medicinal properties.
A. plant from whose leaves are extracted
B. plant from whose leaves is extracted
C. plant from whose leaves they extract
D. plant, from its leaves is extracted
E. plant with leaves for extracting
I don’t know why the answer is B…shouldn’t it be “whose leaves are extracted” instead of “whose leaves is” since “leaves” is plural. Another question is shouldn’t “whose” only be used for people? Also, why is E wrong? Someone please enlighten me.