Why is________ you are so late for the class?

On his way to the airport, it ________ him all of a sudden that he had forgotten her birthday.

What _______ if you don’t finish your work on time?–Mrs Brown will be very angry.

Would you like coffee or tea?—Coffee, please. By the way, do you have milk? I like coffee_____ milk.[ ]

Recently there have been many occasions____ you have attended events on your own.