1 . 根据所给首字母及其英文释义写出该单词(每空一词)。
1. f__________: a border between two countries
2. m__________: earth that has become wet and sticky
3. m__________: the crime of intentionally killing a person
4. g__________: an officer of very high rank in the army
5. c__________: a person who is not a member of the police or the armed forces
6. b__________: a weapon that explodes and is used to kill or hurt people or to damage buildings