How old is the baby boy?——He is an ________ boy.

_____ do you go to the cinema?—Once a month.[ ]

We still don’t know what _________ while we were away from home.

Not until the train pulled into the next station ______ that his briefcase had gone.

Congratulations! You’ve got the first prize in the English Contest.—_____ it be true? It’s unbelievable!