填空题 Fill in the blanks with words or the expression given below.familiarinstructorweaponcancelorganic(1) (填空题) ____ produced without the use of artificial chemicals(2) (填空题) ____ an object used in fighting war(3) (填空题) ____ when you know something well because you've seen or heard it before(4) (填空题) ____ to stop an event from happening(5) (填空题) ____ a person who teaches a skill