Câu hỏi: In the early 1900's, Pennsylvania's industries grew rapidly, a growth sometimes accompanied by disputes labor.

A. the early 1900’s

B. industries

C. accompanied by

D. labor

Câu 1: I like the fresh air and green trees of the village which I spent my vacation last year.

A. I like

B. which

C. spent

D. last

Câu 2: When mining for gold, you must first obtain the gold ore and then apart the gold from the ore.

A. When mining

B. must first

C. and then

D. apart

Câu 3: I was amazed that Smith showed so few grief at his mother’s death.

A. was

B. amazed

C. showed

D. few

Câu 4: Because blood from different individuals may different in the type of antigen on the surface of the red cells and the type of antibody in the plasma, a dangerous reaction can occur between the donor and recipient in a blood transfusion.

A. Because

B. different

C. can occur

D. and

Câu 5: When precipitation occurs, some of it evaporates, some runs off the surface it strikes, and some sinking into the ground.

A. When

B. it

C. runs off

D. sinking

Câu 6: Dinosaurs became extinct millions of years ago because of the earth's climate changed drastically.

A. became extinct

B. because of

C. The earth’s

D. drastically