Defining and non-defining clauses

1. Tom’s brother ______ works at the supermarket is a friend of mine.

2. The bike, __________ is broken, is in the garage

3. The woman _______ won last year’s jackpot bought a lottery ticket.

4. The country of Costa Rica,  ________ extinct species such as the golden toad once thrived, has extensive measures in place to protect endangered rainforest animals.

5. Here are some cells_______ have been affected.

6.His brother _______ works at the supermarket is a friend of mine.

7. Choose the correct variant. Which sentanses offers an additional information?

8. Do the Defining clauses need punctuation marks?

8. Allen, who scored three goals in the first game, was the only player to perform well.

10. What are the names of pronouns that are used with Defining and non-defining clauses?