1.首先,很重要的一點,你必須明白：不是一看到fact that就斷定是同位語從句.
好了,這點明白了的話,我可以告訴你:it在句It is a fact that English is being accepted as an international language. 中充當形式主語,就是that English is being accepted as an international languag太長了,做主語放前面不免頭重腳輕,故用形式主語it把它甩后面去.可以還原為：That English is being accepted as an international language is a fact.如果題中原句是同位語的話還少了成分!同位語應(yīng)該這樣說：The fact that English is being accepted as an international language is true.（is true就是原句少了的成分.）
2.what little是固定用法.表示僅有的一丁點兒……
It is said that the worst drought in the century is drawing what little drinkable water is left.
據(jù)說本世紀最嚴重的一場干旱把僅剩的（由left譯出 )一丁點兒（由what little譯出）可以飲用的水都帶走了.
3.對.stay/turn/go/get/becom/keep等是聯(lián)系動詞,后接形容詞,一般用現(xiàn)在時（加s)或過去時（加ed）,不用進行式.因為肉保持新鮮是一直持續(xù)的一種狀態(tài),不是去刻意強調(diào)具體的正在進行的動作（不可能正在保持新鮮,意思不通.）.
4.Must I \ May I \ Could I 提問,分別應(yīng)該用：Yes,you must.或No,you needn't.(注意不是mustn't!)；Yes,you can.或No, you can't.（注意回答不是用may,may I只是提問者故意使用委婉的語氣征求別人意見,而回答不需要再用may,因為這時回答不需要征求對方意見了.提問需要!）；could也表示委婉,回答同may I.
5.by后面是否加定冠詞the,是這樣分的：
（1).by后面名詞是籠統(tǒng)的概念,比如
The workers are paid by hour/day/week/month/year等,不加the.
（2)by后面名詞是具體的單位或具體數(shù)字加單位,比如
The vegetable is sold by the jin.蔬菜按斤出售.這時要加the.
同理,sell by weight中weight是籠統(tǒng)的概念,因為weight包含jin,表示出售的方式（按重量銷售.）所以不加； 而sell by the dozen中dozen是具體的數(shù)量,12個,要加the.
6.A選項a great success 中,success是名詞,英語中有這樣一條：當success表示具體的成功（作名詞）時,是可數(shù)的.可以說a success!不過,兩者都可以.
7.都可以.