A.Thepiano
B.Theviolin
C.Thetrombone
D.Theaccordion
A.marriedperson
B.middleschoolstudent
C.collegestudent
D.ateacher
A.essential
B.impossible
C.valuable
D.unavoidable
A.last
B.next
C.uncertain
D.premier
A.clean
B.keep
C.weaken
D.refresh
A.drive
B.shift
C.put
D.drag