根据所给的中文、音标或首字母提示，写出空白处各单词的适当形式，每空限填一词。

I have twin brothers, Tim and Tom. They look the same and l 小题1:  of people don’t know who is who. They are   小题2:  /tl / and thin. They have brown hair and blue   小题3:  (眼睛), and they always wear jeans and T-shirts.

They like eating the same food, and they like doing the same things, too. For example, tomatoes and   小题4:  (土豆) are their favorite food. They enjoy   小题5:  (游泳) and playing football. They’d like to play computer games every n 小题6: , but our mother says they can’t because they have much   小题7: (家庭作业) to do.

They’re twins, but they aren’t the same in everything. For example, Tim works very   小题8:  /hB:d/ at school, but Tom doesn’t. Tim’s favorite subject is math but Tom is   小题9:  (感兴趣的) in history.

Our mother often   小题10: (离开) home for her job, so we all help with the housework at home.

I think it’s fun to have twin brothers. We are all happy to be brothers in the same family.

用如图所示装置进行实验，将A逐滴加入B中：

a．若B为Na₂CO₃粉末，C为C₆H₅ONa溶液，实验中观察到小试管内溶液由澄清变浑浊，则试管C中化学反应的离子方程式______．然后往烧杯中加入沸水，可观察到试管C中的现象______．

b．若B是生石灰，观察到C溶液中先形成沉淀，然后沉淀溶解．当沉淀完全溶解，恰好变澄清时，关闭E．然后往小试管中加入3滴乙醛，再往烧杯中加入热水，静置片刻，观察到试管壁出现光亮的银镜，则A是______（填名称），C是______（填化学式）．与乙醛溶液混合后，该溶液中反应的化学方程式______．仪器D在此实验中的作用是______．