2 . If you don’t know the exact meaning of the word, you may r______ to (参考) your dictionary. （根据中英文提示拼写单词）

4 . There are more and more new Internet platforms for us to e_______(交流) information. (根据中英文提示拼写单词)

5 . However serious a problem you may meet, you should face the c_______(挑战) bravely. （根据中英文提示拼写单词）

6 . We can hire bikes for a day to e_________(探索) the town. （根据中英文提示拼写单词）

7 . One good way to improve our spoken English is to take every o________ (机会) to communicate with others. (根据中英文提示拼写单词)

8 . Undoubtedly, more and more people are experiencing mental p________ (压力) in our life. (根据中英文提示拼写单词)

9 . If you are trapped in an elevator, you should stay c________ (镇静的) and call for help. (根据中英文提示拼写单词)

10 . When I got my English paper back, I found my teacher had written the c______ “Not bad!” （根据首字母单词拼写）