根据汉语意思完成句子。

Dear Cindy，

    Thanks for your letter. I miss you very much. It's always nice to hear from you.

    Today is the last day of my exams(考试). The math exam is very difficult, but the other exams are easy. I'm waiting for the summer holiday now. I'm  very excited，because I am going to see you and to be with you again.

    I'm  going to spend my summer holiday in New York with my sister. So we can play together again. I will enjoy our time together. I'm  going to watch football games with you. I think we will have a good time.

    I'm  going to the supermarket later on(过一会儿). I'm  going to buy some presents for you. I  hope you will like them.

Yours，

Jim

①冰雪融化

②KMnO₄分解制O₂

③铝与氧化铁的反应

④钠与水反应

⑤二氧化碳与灼热的木炭反应

⑥碘的升华

⑦Ba（OH）₂•8H₂O和NH₄Cl的反应．

写反义词

坚持____    糟糕____   反常____

若分式方程 $\frac{1}{x-3}+1=\frac{a-x}{x-3}$ 有增根，则 $a$ 的值是（    ）