请根据句意、括号中的中文提示或英文释义，写出句中所缺单词，使句子通顺。

1. Parents shouldn’t leave their babies         (单独) at home.

2. She was always         (紧张) about travelling by air.

3. My sister was born on         2nd, two days after Halloween.

4. Tom, would you         ( give a description of )your feelings of watching

Titanic3D?

5. Simply close your eyes and         deeply, and you will be calm and relaxed.

不用其它试剂鉴别①KNO₃②Ba(OH)₂ ③MgCl₂ ④CuSO₄四种溶液，正确的鉴别顺序是 ( )

A．①④③②

B．④③①②

C．④②③①

D．②①③④