Giải thích chi tiết Nhất có thể cho mình cái này đi ạ ? ( tại sao đi theo Chiều dương mà lại có Góc âm ạ )?

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LM JUP E VS Ạ EM camonn nhaaa iuuu moahhh nè X/ Rewrite the sentence without changing the meaning 1. Keeping the environment clean is very important. - It’s …………………………………………………………………………….. 2. They will show the time machine to the public when they finish it. - The time machine …………………………………………………………………….. 3. He was delighted to receive his aunt’s letter. - He was delighted that ……………………………………………………………….. 4. Old car tires are recycled to make shoes and sandals. - People ……………………………………………………………………………….. 5. I’m very sad that I wasn’t accepted in that group. - I’m very sad not ……………………………………………………………………. 6. It’s three years since I last spoke to her. - I haven’t ……………………………………………………………………………… 7. Tam doesn’t type as fast as she used to. - Tam used …………………………………………………………………………….. 8. “ Please turn down the radio for me”, said my father. - My father asked ……………………………………………………………………… 9. Lan will be fifteen next week. - It is Lan’s …………………………………………………………………………….. 10. How long is it since you used the pen? - When ………………………………………………………………………….?