Have you ever ________ to Qingdao There is ______ aquarium at the seaside.

Look! There are __________ on the desk.

With the Internet widely used, a(an)___change has taken place in the way people communicate with one another.

What about your self-drive trip yesterday? — Tiring! The road Was being widened，and we _________ rough ride

The air is badly ________.And there’s more water _______ in the world.