1 . It is more likely that none of us would like to start a conversation with strangers, because it is awkward and ________(challenge). (所给词的适当形式填空)

2 . I do believe I am________(suit) for this voluntary work, because I have a good knowledge of English. (用所给词的适当形式填空)

3 . Obviously, the man is ________(内行的) in driving. (根据汉语提示单词拼写)