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1) We launch space craft and know a lot about our universe, the nearest planets and stars. However, we know surprisingly little about the place we live in, and one of the ___ (GREAT) mysteries of the planet is the ocean
2) It ___ (OCCUPY) a vast area and there are still so many mysteries hidden in depths!
3) Everyone knows that life first appeared in the water. Later some of the creatures ___ (COME) out of the ocean on to the land, and the others stayed there
4) The ocean ___ (CHANGE) a lot since those prehistoric times but it is still a place where life is rich and diverse
5) Nowadays the ocean ___ (INHABIT) by millions of amazing creatures too
6) They are tiny and huge, and some of ___ (THEY) look as fantastic as aliens from other planets
7) Marine researchers wish they ___ (CAN) get to the bottom of the ocean to explore it, but unfortunately it is not possible now
8) There ___ (BE) no technology yet that can allow people to go so deep under the water
9) The ocean is still keeping ___ (IT) secrets​