Đáp án B
- Method + of..cách thức, phương pháp
“We use modern methods of teaching and learning” (Chúng tôi sử dụng phương pháp dạy và học hiện đại)
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.