Viết lại các câu sau

Viết lại các câu sau
1. They will show the time machine to the public when they finish it
=>the time machine.......
2.he was delighted that to receivi his aunt's letter
=> he was delighted that his ......
3. Old car are recycled to make shoes and sandal
=> people........
4.I am very sad that I wasn't accepted in that group
=> I am very Sad not.....