Đáp án C
Từ cần điền vào là đại từ quan hệ which/ that để thay thế cho “weather pattern” ở phía trước
“The warming of the Pacific Ocean has created weather pattern that strongly affect the world” (Sự ấm lên của Thái Bình Dương đã tạo ra những kiểu thời tiết mà ảnh hưởng lớn đến thế giới.)
Scientists are unsure of the reason for this (27) ¬________ on the global scale either.
In time of (27) __________ transportation can rush aid to persons in areas stricken by floods, families and earthquakes.
Being this close to a twister is (27) ______. He must get away quickly.
Archaeological evidence also indicates that ball games were common among ancient peoples as (27) _____as the Chinese and the Aztecs.