In the text below some words are missing. Select appropriate words to fill the gaps.

As we know from tsunamis when water is moving at 50 or 60 kilometers an hour it (1) …………. deadly. Even if a wave only comes up to the knees, the (2) …………………. can knock a person down. Water flows around some (3) ………………. while slamming into large objects, such as walls, which stand in its way. It also gathers (4) ………………., like rocks and trees, as it flows, causing even more destruction when it (5) ……………………… into buildings.

(1) obstacles (2) rubbish (3) crashes (4) energy (5) becomes (6) debris (7) force (8) comes

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