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: 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 2: When many of my friends take a shower in the morning, I usually take one before bed.

A. When

B. many of my friends

C. one

D. before bed

Câu 3: He has made a lot of mistakes in his writing because his carelessness.

A. made

B. mistakes

C. in

D. because

Câu 4: Since January this year, Joe has suffered two injuries, one to his ankle and the other in New York.

A. Since

B. has suffered

C. one to

D. in New York

Câu 5: The Greek historian Herodotus reported that one hundred thousand men are employed for twenty years to build the Great Pyramid at Gizeh.

A. are

B. for

C. to build

D. at Gizeh

Câu 6: People are not allowed enter the park after midnight because of lack of security.

A. allowed enter

B. after

C. because of

D. of