明日までです！英文の誤文訂正です。詳しい方よろしく

質問

かっこ()には間違いがあるそうで、その正しい答えを教えてください！全部で10問あります。少しでも良いので答えて下さると嬉しいです。

The patient had (a so severe pain) in the back yesterday that he could hardly get out of bed.杏林大学

Nancy complains that she (suffers) from alternate stomachache and diarrhea in succession for two weeks.杏林大学

The patient (had been health) until last August, when he was admitted to the hospital because of a heart attack.
杏林大学

There still (exist) much to be leaned about various seaweeds and their value to humans.杏林大学

The concept (which) fibers should be taken in in order to prevent colon cancer is a comparatively recent one.杏林大学

It was a close game and it was a long time before the (existing) spectators left the stadium.日本大学

The number of people in the world (are) now rising explosively, and famine is not merely a potential but is already a fact.
日本大学

It was very kind of you to look up my new address and (took) the trouble of forwarding the letter.日本大学

I have (a good news); my brother and I are going to the United States to study in August.日本大学

It is not at all strange for me to prefer being alone something (than) being with friends.
日本大学

以上10門です。よろしくお願い致します！

回答No.1

Nakay702

以下のとおりお答えします。

・The patient had (a so severe pain) in the back yesterday that he could hardly get out of bed. ⇒ (a pain so severe)
・Nancy complains that she (suffers) from alternate stomachache and diarrhea in succession for two weeks. ⇒ (has been suffered)
・The patient (had been health) until last August, when he was admitted to the hospital because of a heart attack. ⇒ (had had been healthy) 自信ありません。
・There still (exist) much to be leaned about various seaweeds and their value to humans. ⇒ (exists)
・The concept (which) fibers should be taken in in order to prevent colon cancer is a comparatively recent one. ⇒ (that) 同格節を導くのはthat。
・It was a close game and it was a long time before the (existing) spectators left the stadium. ⇒ (exciting) 似た綴りで錯覚を誘っている？（変な問題！）
・The number of people in the world (are) now rising explosively, and famine is not merely a potential but is already a fact. ⇒ (is)
・It was very kind of you to look up my new address and (took) the trouble of forwarding the letter. ⇒ (take) または (to take)
・I have (a good news); my brother and I are going to the United States to study in August. ⇒ (a piece of good news)
・It is not at all strange for me to prefer being alone something (than) being with friends. ⇒ (to) 「より好む」の意のprefer の後にはthanでなくtoが来る。