V. Выберите правильную форму сказуемого

1. Early wells … with impact-type tools.

a) drilled; b) were drilled; c) were produced.

2. The drill bit … while bearing down the bottom.

a) rotates; b) drills; c) suspends.

3. A large amount of oil … before the well could be capped and brought under control.

a) was transmitted; b) was penetrated; c) was wasted.