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。

小题1:I had thought Paul worked very hard, but on the c      , he was very lazy.

小题2:Women in modern society find it difficult to keep a b      between career and family.

小题3:You’d better inform me of the date of the meeting in a         .

小题4:We should take m     to prevent students from using cell phones in class.

小题5:How can I c        you of what I said?

小题6:Jim a        (争辩) that he hadn’t stolen Lily’s watch.

小题7:Last Sunday I visited the largest wildlife        (保护区) in our country.

小题8:You had better       (咨询) your English teacher on how to learn English well.

小题9:During the war this village was       (包围) by the enemy and more than 200 people were killed.

小题10:It is l        (可能的) that the price of houses will go up.

如图所示，质量为m的摆球A悬挂在车架上．求在上述各种情况下，摆线与竖直方向的夹角α 和线中的张力T：

（1）小车沿水平方向作匀速运动

（2）小车沿水平方向作加速度为a的运动．