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.

Please tell us the reason when he left without saying goodbye.

Robots in the home might not be enough creative to do the cooking, plan the meal and so on.

Unless there had been a heavy storm, the climbers will not have died.

The mother asked her son if he would have the floor clean the day before.

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

For the first time in the history of the country, the person which was recommended by the president to replace a retiring justice on the Supreme Court is a woman.

Câu 226: Teddy Roosevelt demonstrated his competitive spirit and tireless energy in 1905 whenever he led the Rough Riders up San Juan Hill.