Sửa lại lỗi sai trong văn bản

Sửa lại lỗi sai trong văn bản ( giúp tôi với , tôi méo hiểu gì hết )
Students didn’t have a chance of studying with projectors twenty years ago , most teachers rely solely on books and blackboards, however the method made students feel boring and hardly focus on the lessons.  Moreover, some pictures, drawings or objects used for illustration were not big enough for all students to see clearly, which led them to crowd into a place to see these pictures. They had to use pictures or draw on the board with chalk , which took time but was ineffective . Nowadays, projectors are widely used in classrooms . The projector helps to eliminate the traditional passive teaching model , increase the interaction between students and teachers, and help the ability to absorb lessons better . Students do not have to spend a lot of time waiting for them to write on the board and exchange content directly with the teacher,...Scientific phenomena, people, plants, animals are illustrated through videos, pictures and sounds students enjoyable and amazed at what is going on making learning easier. In my opinion, using a projector is a great change, saves time in teaching and keeping children engaged. It also provides more information in an effective and detailed way. I feel thankful for being lucky enough to have been born into a modern life.  Besides, these changes will continue thanks to the development of technology and the Internet.