1 . He is a ________(谨慎的) person, so whatever he does, he is not only discreet (慎重的) but careful as well. (根据汉语提示单词拼写)

2 . The boss is c__________ about making promises and once he did, he will keep it.

3 . The scientists are c_________ about using the new medical treatment on humans.

4 . I’m __________(谨慎) about what I say because careless remarks will hurt one’s feelings. （根据汉语提示单词拼写）

5 . Tom is so c__________ a driver as never causes accidents. (根据首字母单词拼写)