參考答案及解析:
1. had前加that/which.由that/which引導定語從句
2. 去掉the.in consequence of 為習語
3.almost—about/around
4. developing—developed.過去分詞表示該工藝已經開發完成
5. considerately—considerably.兩者為形近詞,前者意為“體諒地,體貼地”,后者則是“相當地”
6. 在war前加to.此處為due not only to...but chiefly to...的結構
7. occurence—occurrence.拼寫錯誤
8. efficiency—effect.in effect為習語,相當于in fact
9. economical—economic.前者意味“節省的,經濟的”,后者意為“經濟狀況的,與經濟相關的”
10. economics—economy.前者意為“經濟學”,后者意為“經濟”
n. 礦,礦石