17. The grape is the ___________ , juicy fruit of a woody vine.
(A) skin
(B) which is smooth
(C) smooth skin
(D) smooth-skinned
18. In the second half of the nineteenth century, textiles from the southwestern United state, particularly fabrics woven by the Navajo people, _____________________ .
(A) began to be used as rugs
(B) rugs began to be used
(C) as rugs began to be used
(D) began to used them as rugs
19. During adolescence many young people begin to question ------ held by their families.
(A) the values
(B) of the values
(C) the values are
(D) are the values
