The verb form of 'hard''is

Five fledgling sea eagles left their nests western Scotland this summer, bringing to 34 the number of wild birds successfully raised since transplants from Norway began in 1975.

In order to to avoid earthquake hazards , civil engineers had better ____ soil before making high -rise buildings.

He is called a genius. Here the verb is-

One of the child's teeth is very ___ and will soon fall out.