根据括号中所给的汉语写出单词，使句子意思完整正确。
1. I think the ________ (第六) lesson is the most difficult of all.
2. Come over to my house this evening and enjoy the fresh ________ (鱼肉).
3. When we climb the hill on Sundays, Jack always ________ (到达) at the top first.
4. Susan often goes swimming in summer when it's warm and ________ (晴朗的).
5. Sometimes we don't have our PE classes outside because of the bad ________ (天气).
