__________ pleasant experience it is! I think I won’t forget the tour to Xi’an for ever.

_________ important news he told me this morning!

—     useful invention it is.—Yes, It helps us a lot.

 —  ________ invention the wheel is! — I can’t agree more. It is an invention that changed the world.

—______ bad weather!—Yes, but it’s going to be fine soon, I think.