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 flesh__________ (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)．