Chọn từ thích hợp điền vào chỗ trống: There is much more water than land on the

There is much more water than land on the (1)....(outer / outside / surface / cover ) of the earth. The seas and oceans cover nearly four fifths of the whole word, and only one fifth of it is land. If you travelled over the earth in different directions, you would have to spend (2) ...... (much / many / few / too) more of your time (3) .......... (move / to move . moved / moving) on water than on roads or railways. We sometimes forget that for every mile of land there are four miles of water.
There is so much water on the surface of our earth taht we have to use two words to describe. We use the word " seas" (4)........ (describe / to describe / described / describing) those partd of water surface which is only a few hundreds of miles wide, the word "oceans" to describe the huge area of water (5)......... (they / what / which / where) are thousands of miles wide and very deep.