viết lại các câu sau sao cho nghĩa không thay đổi
1.According to the rules. It's necessary for students to hand in their assignment on time.
→ Students....................................................................................................
2.It isn't necessary for cathy to buy new text books because she can brrow them from library
→ Cathy......................................................................................................
.........don't have to hand in their assignment on time
........doesn't have to buy new text books because she can borrow them from library
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