1.On receiving the invitation,so excited was Sue that she stood for quite a while speechless.
2.The purse found on the playground matches the description by Mary,so it must be hers.
3.Many children are left behind in the countryside when their parents flood into the cities for jobs.
4.It is the test system,rather than the teachers,that is to blame for the students' heavy burden nowadays.
5.Mr.Smith often stays up,preparing lessons,books spread all over the desk.ok