Answer:
Since the middle of the 20th century, scientists <u>have found</u> cures for many diseases. However, so far no one <u>has discovered</u>
Explanation:
those are the perfect tenses for (find) and (discover)
Susan B. Anthony is associated with suffrage.
Answer:
It doesn´t, taken in account the word <em>long.</em>
Explanation:
It seems to me that the question should be formulated like this:
<em>How does this document etc.</em>
Because the either supporting or expanding of the textbook version can´t be measured in time; you either support it or you expand on it.
