根据首字母或所给中文提示，写出正确的单词完成句子。

1.The experiment c___________ by Pro. Smith proved to be a great success.

2. The naughty boy was punished because he didn't  o______ the school rule.

3. Tom has got divorced from Jill,but as her ex-husband,he still have a____to their only child at weekends.

4. The young man showed great _______ (同情) to the disabled.

5. The killer whales helped the whalers catch the baleen whales on their _________(每年度的)migration..

能够用来鉴别NH₄Cl、NaCl、Na₂CO₃三种物质的试剂是（　　）

A．AgNO₃溶液

B．Ba（OH）₂溶液

C．稀盐酸

D．NaOH溶液