It is common practice __________ a battery when it still has some life in it .
举一反三
- It is common practice a battery when it still has some life in it.
- It is common practice( )a battery when it still has some life in it.
- It was common practice then that when the store owners wanted to go on vacation they simply .
- His (__) (pronounce) has improved，but he still does much practice every day.
- lt was common practice then that when the store owners wanted to go on vacation they simply c____.(暂时关闭)