Rewrite:
1.We should get up early to walk to school.
->It's a good.................................................
2.He needs to excercise about 1 hour a day to live longer.
->It's......................
->It's a good.................................
3.Students need to revise new words regularly.
->It's.................................
->revising............................
->It's a good.............................
Rewrite:
1.We should get up early to walk to school.
->It's a good idea to get up early to walk to school.
2.He needs to excercise about 1 hour a day to live longer.
->It's necessary to excercise about 1 hour a day to live longer.
->It's a good idea to excercise about 1 hour a day to live longer.
3.Students need to revise new words regularly.
->It's necessary to revise new words regularly.
->revising new words regularly is necessary
->It's a good idea to revise new words regularly.