Who is singing in the next room—___________ must be Marie.

对下列各项中特殊句式不相同的一项是

He took the machine to pieces to find out how it .

you look worried. Anything I can do for you— I ______ if you could give me a three-day leave to look after my baby in hospital.

So______ that most parents are too worried to let their kids travel alone at the beginning of the new term.