_____ of them knows Japanese, so I have to ask a third person for help.—You’d better ask Tom for help. He is good at Japanese.

______has the children burdened with too much homework nowadays?

I’m______ building a new factory here.It will be bad for the environment. [ ]

We talked _______ until Mr Wu asked us _______.

Whose schoolbag is this?—It ___________ be Mary’s. It has her name on it.