VII. Определите, какой частью речи является подчёркнутое слово в предложении

1. After screening to remove the rock chips, the returning mud is held in open pits to be recalculated through the well.

a) причастие I; b) герундий; c) глагол.

2. Such wasteful practices were gradually halted, partly by the increasing difficulty of finding new petroleum reservoirs and partly by the increased uses for natural gas.

a) причастие II; b) глагол; c) причастие I.

3. The drilling had to be interrupted periodically to allow loose rock chips to be removed with a basket-like device on the cable.

a) отглагольное существительное; b) герундий; c) причастие I .