1) Those guys always make a mess. I can't stand . 2) Mary is my Best friend. I hang out with every day.

3) Let's watch this documentary. is very good.

4) Help us, please. don't understand the exercise.

1. Those guys always make a mess. I can't stand them.

2. Mary is my best friend. I hang out with her every day.

3. Let's watch this documentary. It is very good.

4. Help us, please. We don't understand the exercise.