Who collect the letters in the letter box?

Who catch robbers and thieves?

In villages, most of the peoples are:

Which of the following are small places?

The air is fresh in the:

Pick the odd one.

Who is a person engaged in agriculture?

What are often social communities with considerable face-to-face interaction among members called as?

Who helps the doctor?

Which  is a health care institution providing patient treatment by specialized staff and equipment?