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.
这是道挑错题，正确答案是while still making有错，急求解释！！！

1 x' g8 h- J! ASince 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.
$ j" }3 h" J# e. {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.
正确答案是emphasizing on有错， 是要改成emphasis吗？动名词不行么？
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7 H) u6 L/ f/ g9 I- C# \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。
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.
8 S2 E6 ?2 X, H4 @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。
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。