Subject or object pronoun? — Choose the right answer!

Anna is my best friend. ___ often calls ___ in the evening, and I usually call ___ back.

Tom has a new car. ___ loves ___ because ___ is very comfortable.

My parents live near me. ___ often visit ___ at weekends, and I sometimes cook dinner for ___.

Sarah works with Mark. ___ likes ___ because ___ is very helpful.

My sister and I love animals. ___ have two cats, and ___ often sleep next to ___.

Emma, can ___ help ___ with my homework? I really need your help.

I know Peter and Julia, but I don't see ___ very often because ___ live in another city.