1.   A particularly interesting feature of the trestle piers was the method used for founding them on irregular river beds.

2.   It was thus possible to assemble a bridge pier and lower it complete on to the river bed.

3.   The cryptocorynes occur mainly in cultures of single species on overgrown river beds and are exposed to the conditions of amphibious life.

4.   The entrepreneur made a million dollars out of Pet Rocks-rocks that you could find in any river bed.

5.   The water clouded and I could no longer see the river bed.

6.   These species do not grow in association with Lagenandra and Hygrophila because they do not occur in river beds.

7.   They found some interesting stones on the river bed.

8.   They walked along a dry river bed.

9.   To my astonishment I find that we use the river bed as a road.

10.   We walked along the dried-up river bed.