英文脑筋急转弯1.what tree is always sad?2.what wather do mice and r

英文脑筋急转弯
1.what tree is always sad?
2.what wather do mice and rats fear?
3.why are people tried on April Fool's Day?
4.what country is popular on Thanksgiving Day?
5.why is an empty purse always the same?
6.when can you get water with a net?
7.what is full when it's used and empty when it's at rest?
8.what do every couple have in common?