1.Ill take down your name and address in case you ______ as a witness.

　　A.are needed B.need C.will be needed D.will need

　　2.Vegetables are cheap______ when they are in season.

　　A.buying B.to buy C.to be bought D.to buy them

　　3.Gone _____ the Chinese people were in great lack of food,money, comfort and enough housing.

　　A.the days when B.are the days when

　　C.have the days when D.the days have when

　　看看答案吧：

　　1.C 此句譯為我將記下你的姓名和地址，以防萬一需要你作證,這是被動語態的基本用法,我或別的什么人需要你作證人,但沒必要指出來,因為這里強調的是動作的承受者,所以用將來時的被動語態.

　　2.B 當不定式作表語(或賓補)形容詞的狀語,又與句中的主語(或賓語)有邏輯上的動賓關系時,雖然不定式有被動意義,但只能用主動形式.eg:Some books are interesting to read ,but boring to learn有些書讀起來很有趣,但學起來很枯燥.

　　3.B 此句譯為中國人糧食極其匱乏，經濟拮據，生活不安逸，住房又緊缺的日子已經一去不復返 ,如果過去分詞是不及物動詞,這個動詞已經是形容詞化了的分詞,則為系表結構,這里gone提前,用的倒裝結構.