How did it come about that you failed to ______ in time for the meeting yesterday?

How long ________ you _______ the book — For only a week.

_____ more and more students graduating from college, it is harder for them to find suitable jobs.

Someone is knocking at the door. Who _____ it be?— It must be the milkman.[ ]

Could you tell me something more aboutHong Kong—–I am ______going there for a holidaysoon