— He’s often seen to help others,     ?—       . He’s helpful. We all like him.

Zhu Zhiwen’s never been to Hongkong, _______?

I don’t know if Mr Green ________. If he ______, I will let you know.

Few people knew how to use the Internet in the past,_____?

— Mary’s father seldom has breakfast at home,          ?—          . He has it on his way to work.