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: 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 2: It was not when he talked to her that he knew the truth.

A. was not

B. when

C. talked to

D. knew the truth

Câu 3: 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 4: Neither his parents nor his teacher are satisfied with his result when he was at school.

A. neither

B. nor

C. are

D. with

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: 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