SC's Question number - 983, 984

983). The skill and the precision of the Anasazi, ancient inhabitants of the Southwest, in measuring the movements of the Sun and Moon is evidenced not only at Chaco Canyon but at a number of other sites.

(A) in measuring the movements of the Sun and Moon is evidenced not only at

(B) in measuring the movements of the Sun and Moon are evidenced not only at

(C) in measuring the movements of the Sun and Moon is evidenced at not only

(D) to measure the movements of the Sun and Moon is evidenced at not only

(E) to measure the movements of the Sun and Moon are evidenced not only at

984). There is ample evidence, derived from the lore of traditional folk medicine, that naturally occurring antibiotics are usually able to be modified to make them a more effective drug.

(A) are usually able to be modified to make them a more effective drug

(B) are usually able to be modified to make them more effective drugs

(C) are usually able to be modified, which makes them more effective drug

(D) can usually be modified to make them a more effective drug

(E) can usually be modified to make them more effective drugs


Answers --

983). B is the best choice.

A, C, D - incorrect - Plural subject so we need are not is

E - incorrect - Idiom: skill in doing something.
His skill in teaching is better than His skill to teach

984). E is the best choice.

A, B, C - incorrect - "able to be" - On GMAT if active voice is correct, it is preferred over passive voice

D - incorrect - violates parallelism - must be ......antibiotics .... drugs