Can somebody help me with these excercise?

ARTICLES
- that is the girl we were talking about.
- Would you like an orange?
- I want to buy a phone. The phone must be modern.
- The Earth goes round the sun
- I've got a cat and a hamster
- Can you give me the key that is on the table over there?
- I found a new book. The book is about animals.
- How do you like the food that they serve here?
- I live in a nice city. The city is called Galway.
- I work in the factory (This could be right in certain contexts but it would be quite unusual. If someone asked "What is your job?" you would say "I work in a factory") 

PREPOSITIONS
- I will leave for work at 7:00 a.m.
- I will call you in a couple of days.
- The dog stayed in the yard all day
- Simon sells hotdogs on O'Conell street
- When the children are in bed, let's watch TV.
- I was born on 5th August. (This is OK for US English. In the UK we would write "on the 5th of August") 
- I couldn't find the book I wanted in the library.
- There are some good stories in that magazine
- John's already at home (Eu escreveria assim. Nos Estados Unidos, acho que é mais. Comum de escrever "John's already home" (sem preposição) mas ambos são aceitáveis)

GENERAL
- Did you do any sports at school?
- I don't follow a very healthy lifestyle
- I've always been fascinated by modern art (or "interested in". "Fascinated by" is stronger though) 
- I'm really tired of working here
- Stop worrying about me
- Have you ever had/done a go at bungee jumping. (You could say "have you ever done a bungee jump" or "have you ever had a go at bungee jumping". "Have a go at..." significa "experimentar" mas apenas é usado com experiências, não comida, por exemplo.)