relative clauses

Rio de Janeiro, (a)   is famous for its carnival, is the most visited city in South America.

Having full service is the reason (a)   I always choose resort hotels for my holidays.

Meryl Streep, (a)   is an American actress, still holds the record for the most award nominations.

Rock climbing is an activity (a)   needs a lot of courage and strength.

Students (a)   are planning to volunteer at the Winter Games must give in their names by tomorrow.

She is the singer (a)   new single went straight to number one in charts

1997 was the year (a)   Robbie Williams released his first solo album.

This is the archaelogical museum. It was built in 1958.

This is the archaelogical museum (a)  

That's the librarian. She helped me with my research project.

That's the librarian (a)  

This is Rick's brother. He bought me the ticket to the football finals.

This is (a)