He lives____but he doesn't feel____.
A：alone, alone
B：lonely, alone
C：alone, lonely
D：lonely, lonely
容易导电的物体叫____，如____、____、____，不易导电的物体叫____，如____、____、____．
想一想，填一填。
一____城市 一____公路 一____树林
两____工程师 一____楔子 一____心
写出常见原子团符号和化合价： ____
I scared of dogs ever since a dog hurt me when I was five years old.
