1.can't be an experienced chemistry professor.
2.natural balance has been destroyed
3.wasn't long before
4.when a sudden scream
5.Having finished the work
6.Most of the class were intrested in
1.can't be an experienced chemistry professor.
2.natural balance has been destroyed
3.wasn't long before
4.when a sudden scream
5.Having finished the work
6.Most of the class were intrested in