- The safe _______________ of nuclear waste is a major international problem.
A. disposal B. abandon C. display D. sale
- He is collecting coins and he has a valuable _______________ of rare coins.
A. number B. pile C. packet D. collection
ĐỀ THI THỬ SỐ 6 KỲ THI TUYỂN SINH VÀO LỚP 10