I forgot to include the following sentences. I really hope you can have a look at them, too.

1) But I heard his voice, which sounded very low.
I couldn't see his face because he escaped very quickly.
2) The only thing I remember is that is was carrying something like a gun in his right hand.
3) I felt sorry for my best friend because his girlfriend had dumped him.
4) I was proud of myself (not me) when I got a good mark in my maths test (I made a good grade on my maths test, both possible?):
5) I was ashamed of myself when my teacher reprimanded me in the class register for using my mobile phone during a test.

2 answers

1) However, I heard his voice, which sounded very low.

2) The only thing I remember is that he was carrying something like a gun in his right hand.

3) OK

4) I was proud of myself when I got a good mark in my maths test. (I made a good grade on my maths test, both possible?) Both are correct, yes.

5) OK
2. "is that is was carrying " = is that he was carrying

4. on my math test is more usual

5. in the class register? or simply "in the class"

Sra