Almost all the water gone.Please save water!

Almost all the water gone.Please save water!
Aare B.is Chave Dwere
选B,这道题不应该选C吗,我只知道完成时态和被动语态要用动词过去分词.难道这里是被动语态?
Jane anew dress every month when she was in Shanghai.
Abuys Bis buying Cbought Dwill buy
选C,这道题经过老师的讲解有点明白了,但又有点迷糊,还是希望大家来讲解下哈
Excuse me.May I you to pass me the sugar?
Akeep Bmake Clet Dtrouble
选D,难道表请求还能用trouble,没学过啊…是麻烦别人干什么的意思吗?
最后希望大家能把做英语单项选择题和完形填空的技巧方法说下,有什么需要注意的.尤其是完型填空,我做得很糟糕!