英语单选,such ,so ,such a,a such,等等这类,怎么老搞不清楚啊

英语单选,such ,so ,such a,a such,等等这类,怎么老搞不清楚啊
1.in the area,AIDS is ___disease that the very mention of it strikes terror into the population.
a/a so dreadful
b/so dreadful a
c/such dreadful
d/a such dreadful
2.he teaches singing at a high school and is acknowledged to be ____singer as he is a teacher.
a/so good a
b/as good a
c/a so good
d/a good