What is an antecedent?

Snakes are dangerous if they bite.

They is a pronoun. Snakes is an antecedent. The antecedent is the word that the pronoun is about.

A pronoun must always agree with its antecedent:

Masculine - James cleaned his car.
Feminine - Susan took her dog for a walk.
Neutral - The clouds have changed their direction.
Singular - The student carried his book.
Plural - The students carried their books.

Now choose the pronoun which agrees with the antecedent.

Link: What are extreme adjectives

• 1 - Tom and Bob raced ___ bikes.
  
  their
  his
  them
  
  
• 2 - The players took ___ boots to the game.
  
  their
  them
  his
  
  
• 3 - After taking the test, Lisa said that __ was difficult.
  
  she
  it
  
  
• 4 - The mother bear took ___ babies to the river.
  
  her
  their
  its
  
  
• 5 - The teacher marked the tests and returned ___ back.
  
  it
  its
  them
  their
  
  
• 6 - A student in that girls' school must wear ___ uniform every day.
  
  her
  their
  
  
• 7 - If people want to be rich, ___ have to know work hard.
  
  they
  it
  their
  
  
• 8 - I get excited when my friends bring ___ children over.
  
  his
  their
  its
  
  
• 9 - The teacher said that ___ was proud of them.
  
  it
  he
  they
  
  
• 10 - It is good to read books because ___ can teach us so much.
  
  it
  them
  their
  they