1 . 根据语境，选择下框中的单词替换居中划线部分的词或词块，使之意思一致。

abandoned       tolerate       complicated       thorough released        conservation       frequently       genuine

1. In fact, news reports are often broadcast about extreme rainstorms and heatwaves causing deaths and economic losses.
2. The officer was assigned to conduct a complete investigation into the incident.
3. Before they left the ship, Shackleton calmly called them together and told them to rescue their most essential supplies.
4. While in the beginning such songs and stories had a very simple format, over time they became more complex and more polished.
5. The construction of waste water treatment facilities improved the water quality and water protection.
6. Carbon dioxide is produced through human activities such as destroying forests and burning fossil fuels, as well as natural processes such as volcanic eruptions.
7. He used to be so cross and bad-tempered that nobody could put up with him, but the birth of his son changed his life and made him a better person.
8. Their real concern for others, their perseverance, and their resolve fill me with hope.