Bạn Nam đang chơi đàn ghita. a. Bạn ấy đã thay đổi độ to của âm bằng cách nào? Giải thích tại sao? b. Dao động và tần số dao động của sợi dây đàn khác nhau như thế nào khi bạn ấy chơi nốt cao và nốt thấp?

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Rewrite the sentences 1. The tortoise was running. The hare was sleeping (While) -> ................................................................................................... 2.The girl worked hard. Her stepmother wasn't happy (Although) -> .................................................................................................... 3. Practice speaking English every day or you can't not improve your English (if) -> ....................................................................................................... 4.The last time I saw Lan was at Tam's birthday party (since) -> ....................................................................................................... 5. Tom did not play tennis as well as Jack (Better) -> ....................................................................................................... 6. Vinh really loves to hanging out with his friends -> Vinh really enjoys........................................................................ 7. Playing beach games is very interesting -> It is ................................................................................................ 8. Most ethnic peoples in VietNam speak their own languages (Makes question) -> ....................................................................................................... 9. The hotel we saw first was rather expensive. We decided to look for another (so) -> ....................................................................................................... 10. She lost her job because she was inexperienced ( Because of) -> ....................................................................................................... 11. He likes to listen to pop music than to watch TV after school. -> He prefers ...................................................................................... 12 . They will show the time machine to the public when they finish it. -> The time machine .......................................................................... 13. I would like you to help me to put the chairs away. -> Do you mind ....................................................................................................... 14. Although the weather was bad, she went to school on time. -> In spite of ....................................................................................................... 15. The last time Phong visited Tasmania was five years ago. -> Phong hasn't .................................................................................. 16. We get him to look after our house when we are on business. -> We get ......................................................................................