Question

the police ran ........... the thief.( after ,to) (fill suitable preposition)

Answer 1

the police ran after the thief.
cheer ! .............

Answer 2

ANSWER:

The police ran after the thief.

EXPLANATION:

Prepositions are the words which precede with 'noun' or 'pronoun' to show the relation with other element in the clause. ‘at’, ‘on’,’of’ etc are some of them.  

• ‘at’ is used when the reference is with respect to locations.
• ‘in’ is used with reference to unspecific times during years, days, hours etc.
• ‘with’ is used with reference to indicate being involved or being together.
• ‘after’ can be used as a conjunction as well as a preposition.

If used as a preposition it is followed by a noun. The given sentence supports the usage of ‘after’.