1. museum
I visit a museum.

> This sentence is correct.

2. attitude
I try to have a good attitude.

>  Or I'm trying to have a good attitude/ I tried to have a good attitude.   

3. Christmas
On christmas, I got a Lego from Santa Clause.

> On Christmas,   I got a Lego from Santa Claus.

> Be careful with your spelling, it might give another meaning.   

4. going
I'm going to have to study.

> I'm going to study.

>Or you can also say I have to study.

5. scared
I was scared because I watched a scary movie.

> This sentence is correct.  

6. safety
We have to wear a safty helmet when we ride a bike.

> We have to wear a safety   helmet when we ride a bike.

> This sentence is correct just remember that we always need to double check our writings.

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Hi Eric!

      Your homework was good and you committed only few lapses. Great job! ^^ Continue enhancing your skills and always try answering in a complete sentence.

Take care always. ^^

~Teacher Cassie