The (A) geology professor showed us (B) a sample about (C) volcanic rock which dated back (D) seven hundred years.
A.The (A)
B.us (B)
C.about (C)
D.back (D)

Nero Claudius Caesar, to please themselves (A), killed his mother (B), his brother, and all his advisers (C) and finally killed himself (D) out of self-love.
A.themselves (A)
B.his mother (B)
C.his advisers (C)
D.himself (D)

Children learn primarily (A) by directly experiencing (B) the (C) world around it (D).
A.primarily (A)
B.experiencing (B)
C.the (C)
D.it (D)

Since it was so difficult (A) for American Indians to negotiate (B) a peace treaty or declare war in their native language (C), they used a universal (D) understood form of sign language.
A.so difficult (A)
B.to negotiate (B)
C.in their native language (C)
D.universal (D)

An (A) octopus has three heart to pump (B) blood throughout (C) their (D) body.
A.An (A)
B.to pump (B)
C.throughout (C)
D.their (D)

He spoke few (A) English, so (B) it was difficult for (C) him to communicate (D) with people here.
A.few (A)
B.so (B)
C.for (C)
D.to communicate (D)

Let’s go (A) and have a (B) drink we have a few (C) time left (D).
A.go (A)
B.a (B)
C.a few (C)
D.left (D)

One can only live without water for (A) about ten days because (B) almost 60 percent of their (C) body is (D) water.
A.for (A)
B.because (B)
C.their (C)
D.is (D)

Traveling (A) ballet companies were (B) uncommon before her (C) Augusta Maywood formed the first traveling (D) troupe.
A.Traveling (A)
B.were (B)
C.her (C)
D.traveling (D

Economic goods (A) often consist to (B) material items, but (C) they can also be (D) services to people.
A.goods (A)
B.to (B)
C.but (C)
D.be (D)