1 . He is an impatient guy and always jumps to c________. (根据首字母单词拼写)

2 . In c________, walking is a cheap, safe, enjoyable and readily available form of exercise. （根据首字母单词拼写）

3 . At the end of the class, the students drew a ________ (conclude) that experience as well as interest is the best teacher. (所给词的适当形式填空)

4 . I wonder who makes this decision and how they come to their _____________ (conclude). (所给词的适当形式填空)