1 . Stand with your knees slightly ________.（弯曲）（根据汉语提示单词拼写）

2 . The painting is e________ to be worth over 1 million dollars. （根据首字母单词拼写）

3 . It is ______ (估计) that 25% of all methane that released into the atmosphere came from farm animals.（根据汉语提示单词拼写）