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III. Correct a mistake in each sentence
1. On the floor of this Ocean is hundreds of flat-tipped mountains more than a mile beneath sea level.
2. The development of transistors made them possible to reduce the size of many electronic devices.
3. The lift to the top floor must be repaired; that's why nobody seems to be climbing the staircase.
4. According to many critics, Huckleberry Finn is one of the greatest American novels that ever written.
5. Many of these Indian grass-mats are admirable examples of elegant design, and the colours in which they are woven are
rich, harmonic and effective in the highest degree.