Câu hỏi: 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 1: 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

Câu 2: He has made a lot of mistakes in his writing because his carelessness.

A. made

B. mistakes

C. in

D. because

Câu 3: The Games' organizers faced significant bed shortages because the record number of more than 13,000 athletes and officials who attended the 2006 Games

A. faced

B. bed shortage

C. because

D. attended

Câu 4: I was amazed that Smith showed so few grief at his mother’s death.

A. was

B. amazed

C. showed

D. few

Câu 5: A warning printed on a makeshift lifebuoy says: “This is not a life-saving device. Children should be accompany by their parents.”

A. printed

B. makeshift lifebuoy

C. device

D. accompany

Câu 6: If you need to keep fit, then why not take on a sport such as badminton or tennis?

A. to keep

B. why not take

C. on

D. a sport such as