Question

3. Mohan what the house to check that all the doors were locked. (around)​

Answer 1

you are always worried that you'll forget to turn off all the appliances before you leave the house so you check all of them over and over before you leave. ... “If I don't keep checking the door is locked, someone might break in!”

Answer 2

Mohan checked around the house to check that all the doors were locked.

Here, in place of what, checked around or looked around can be used..