Rewrite: Keeping the environment clean is very important.
I) Viết lại câu sao cho nghĩa không đổi
1) Keeping the environment clean is very important.
=> It'...
2)They will show the time machine to the public when the 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 shandals
=> 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 year
=> It is Lan's...
10. How long is it since you used the pen?
=> When...?