选择正确答案。
( ) 1. 32 －11 = ___________
( ) 2. 19 + 4 = ___________
( ) 3. 41 + 9 = ___________
( ) 4. 48 －13 = ___________
( ) 5. 40 －6 = ___________
( ) 6. 28 + 15 = ___________

A.thirty-four
B.twenty-three
C.forty-three
D.twenty-one
E.fifty
F.thirty-five