It doesn't sound like they are the same. In the second, passive voice sentence it isn't clear who did the exam, whereas it's clear from the first, active voice sentence that "I" did it. ;)

I know just how you can get puzzled by that since both are translated into 'this' in English. So, let's start with "Este", which is a demonstrative pronoun and precedes a male noun. Eg.: Este homem é meu amigo. Because it precedes a noun, it also varies according to it being singular or plural. Eg.: Estes homens são meus amigos. 'Isto', in turn, doesn't work as a determiner as 'este' so it doesn't precede a noun in a sentence (the noun then is usually implied) Eg.: Isto é um lápis Because it doesn't precede a noun, it's invariable either. I hope it was helpful! ;)

Carnaval Acabou!

Brasileiros, como se sentem agora que o carnaval acabou? Alguns brasileiros dizem que eles  (desnecessário o uso do pronome pessoal, sua forma oculta já bastaria) gostam muito do carnaval, enquanto tem outros que odeiam (desnecessário). Vocês ficam felizes ou não?

Bom, eu faço parte do grupo de pessoas que ficam felizes com o fim do carnaval. Gosto de festejar, mas acho a duração da festa (5 dias) um exagero. Abraço! :)

1) (C) At first you may find it odd that "another" is used before 10, as you would expect it to be used with the singular form. However, 'another' can be used before a plural noun when there is a number before that noun. Example": I've already spent 100 dollars in the Casino, and I'm afraid I'll spend another 50 tonight. 2 (B) This is a little trickier. 'The others' usually refers to 'The other people'. Since it seems like Mary is talking about THINGS (not people), I would choose the pronoun 'others', without 'the'. Hope it was helpful! ;)

The 'T' sound is often left out in those words in American English accent.