647). On the Great Plains, nineteenth-century settlers used mud and grass to build their homes, doing it without timber and nails.

(A) settlers used mud and grass to build their homes, doing it without

(B) settlers used mud and grass to build their homes, did it without

(C) settlers used mud and grass to build their homes, making them while not having

(D) settlers used mud and grass to build their homes, making do without

(E) settlers' homes were built of mud and grass, making do without

649). George's personal diary and album formed the basis for his book about the places he had visited.

(A) the basis for his book about the places he had visited.

(B) the basis for his book regarding the places he had visited.

(C) the basis of his book about the places he visited.

(D) the basis of his book about the places which he had visited.

(E) the basis of his book about the places he had visited.