54.
1. animals and dead plants 2. dead animals and plants 3. animals and plants dead 4. animals' death and plants
55. 1. First 2. Next 3. In conclusion 4. For example
56. 1. if 2. unless 3. and 4. because
57. 1. As 2. Until 3. Once 4. Before
58. 1. the skeleton only is left 2. only the skeleton is left 4. the skeleton is left only 3. the skeleton is only left