Technology is developing so rapidly that   for only a year , my cellphone is out-of-date .

_____ with the size of the whole earth, the biggest ocean does not seem big at all.

Rather than ______ at home, he prefers ______ out to play football even on a cold day.

I still remember ____ to the Summer Palace and what I saw there.

When the Eiffel Tower was shown in 1889 at the world exposition, it was not very popular and came close to ______ down.