求解几道SAT语法挑错题~

fernandotorresUID: 3049397

Its settlement of the strike demonstrated that the company can maintain strong labor relations, treat its employees well, while still making a reasonable profit.
+ e  X/ ?' L( k这是道挑错题，正确答案是while still making有错，急求解释！！！

Since the the tiny Republic of San Marino has an area of only 24 square miles plus being completely surrounded by Italy, few people are even aware of its existence.
正确答案是plus being有错， plus不是介词吗？不能这么用么？那该怎么用饿
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What was most apparent at the food science convention was the the industry's continuing emphasizing on health-promoting ingredients.
$ t' V/ M# g( R7 _; U* y正确答案是emphasizing on有错， 是要改成emphasis吗？动名词不行么？

, @. v3 D8 Y9 x& Y' p. K# d谢谢高手解答~

淘淘一夏UID: 2736421

你好，我在大连新东方VIP中心学的，汪老师讲的很好。以前我也搞不懂。
; z7 ^8 s" I* @5 @第一题，前面两个分句+一个主从句，这是有问题的。如果这个地方不错，前面那个treat前就应该+and。也就是说这里面有一个run-on sentence. 所以后面应该用and make a reasonable profit.
% D8 Z; v* V  T第二题 没有being surrounded这种形式。分词表主动的是现在分词，表被动的是过去分词。没有现在分词的被动式。
' n- m5 v/ w0 P' Z' c5 Z第三题，名词所有格后面的名词应该是所属的意思。不能是动名词，动名词有动作过程的意思。