Read the passage carefully and then choose the best answer for each blank

There is much more water than land (6)______ the surface of the earth. The seas and oceans (7)______ nearly four-fifths of the whole world, and only one-fifth of (8)______ land. If you travelled over the earth (9)______ different directions, you would have to spend much more of your time (10)______ on water than on roads or railways. We sometimes forget that (11)______ every mile of land there is four miles of water.

There is much water on the surface of our earth that we (12)______ to use two words to describe. We use the word seas those parts of water surface which (13)______ only a few hundreds of miles wide, the word oceans to describe the huge areas of water which are thousands of miles wide and very deep.

Câu 6 : (6)...................

A. in

B. on

C. from

D. over