69번 문법중에서

(a)[though/even if]the bulk of these new terms are scientific, technical, or of otherwise specialized application,
hundreds of terms find their way into the main body of english each year.

여기서 though 와 even if 의 쓰임이 알고싶습니다. 둘다 뜻이 비슷한데 늬앙스 차이라고 하더라구요.

(c)[such/so] is the accumulation of new formations that dictionaries are going to have to come out every six to eight years rather than every ten to keep up with the new vocabulary.

여기서 저는 so v s ~도 그렇다라고 생각했는데 아니더라구요.

(꾸벅)답변을 부탁드립니다 ^^