1chọn câu trả lời đúng A, B, C hoặc D để điền vào mỗi chỗ trống trong đoạn văn sau Mr.Brown and some................are on a very dirty beach now.Today they are ready to............the beach a clean and beautiful place again.After listening to Mr.Brown’s instructions,they are divided into three groups.Group I needs to walk along the beach.Group 2 should check the sand..........group 3 has to check among the rocks. Garbage must be put into plastic bags, and the bags will be collected by Mr.Brown. He will take the bags to the garbage..........They all are............to work hard to refresh this area 1 A.voluntary Bvolunteers C volunteering D volunteer 2Amake Bget C do Dchange 3Aso Bbut C although Dand 4Adump Byard C area Dplace 5Aexciting Binteresting Ceager D bored