Drains Get Blocked by ____ and ___.
oil
fats
The answer is ‘Oil and fats’
Drains get blocked by oil and fats.
Because oil and fats harden the oil in the sewage pipe and block them.
Fill in the blanks:
(a) Cleaning of water is a process of removing _______.
(b) Wastewater released by houses is called ________.
(c) Dried _______ is used as manure.
(d) Drains get blocked by ________ and ________.