1.   A burst Septic tank is believed to have triggered the landslide.

2.   A hundred years ago it was widely believed that there was life on Mars.

3.   A subterranean stream is believed to flow underneath the town.

4.   Accidents and injuries involving blood or other body fluids were widely believed to be under-reported.

5.   Although the assassins were never caught, it is commonly believed that they were working for the government.

6.   Animal rights activists are believed to have carried out the bomb attack.

7.   Approximately one-fifth of all school children are believed to have special educational needs of one sort or another.

8.   At the beginning of the century it was believed that everything could be understood in terms of continuum mechanics.