根据句意及首字母或汉语提示，写出各句中所缺单词的正确形式。
I had thought Paul worked very hard, but on the c      , he was very lazy.
Women in modern society find it difficult to keep a b      between career and family.
You’d better inform me of the date of the meeting in a         .
We should take m     to prevent students from using cell phones in class.
How can I c        you of what I said?
Jim a        (争辩) that he hadn’t stolen Lily’s watch.
Last Sunday I visited the largest wildlife        (保护区) in our country.
You had better       (咨询) your English teacher on how to learn English well.
During the war this village was       (包围) by the enemy and more than 200 people were killed.
It is l        (可能的) that the price of houses will go up.