Did Liu Ming do a good job in the competition— Yes, he did everything___________.

Latest researches show children with high levels of air pollution during their first year of life run a greater risk of developing certain diseases．

It is very important for us to_______ between good and bad

Since the new director took office, we have worked ___hours, －that is to say, we work more freely.

I wanted to explain, but he didn’t give me any _______.