【推荐1】While ________(walk) alone in the street, I heard my name called. (所给词的适当形式填空)

【推荐2】I ________ (walk) along the river when I heard a drowning boy crying for help. (所给词的适当形式填空）

【推荐3】In the last five years. Cao ________ (walk) through 34 countries in six continents, and in 2016, he reached the top of Kilimanjaro, Africa’s ________ (high) mountain. (所给词的适当形式填空)

【推荐1】When ________ (heat), water can be changed into steam. (所给词的适当形式填空)

【推荐2】While________(walk) in the park yesterday, I met my old friend.（用所给单词适当形式填空）

【推荐3】As ________, his parents give him lots of love instead of high ________.(expect) (所给词的适当形式填空)