根据内容提示完成句子. 1. Wang Peng felt more hopeful as he ______  ________  _______. 2. He did not look forward to _____  ______  ______ because his restaurant was no longer popular. 3. In recent years many of my friends have come to the big city to _______  ______  ______. 4. This produced a chain reaction, which _______  ______  _______ for life to develop. 5. Many millions of years later, the first extremely small plants began to appear _______  _______ _______  _________ the water.