Unfortunately in schools here in the UK, often foreign languages are not considered very important, and therefore the vast majority of British people speak only English. Traditionally French has been the most commonly taught language in schools, with German in second place, though apparently Spanish has now overtaken German. http://www.telegraph.co.uk/news/2016/05/16/how-spanish-is-the-only-foreign-language-growing-in-popularity-i/

Sadly, according to this article, overall interest in learning foreign languages is falling... 

Last year I was in London for three months.

Or

Last year I went to London for three months.

Or

Last year I visited London for three months.

You would use "I've been to London" as a general statement, i.e. "I've been to London three times"

And "I've been in London", you would use if you are currently in London and want to express how long you've been there for, i.e. "I've been in London for one month". 

I hope that answers your question. Please ask if anything isn't clear. :-) 

Practicing "Phrasal Verbs."

This would mean that the guard lost his temper and became very angry when he heard the thief. If you mean that the guard shot at the thief with his shotgun, you could say "The guard started blasting away with his shotgun when he heard the thief"

2- I'm going off to make a Skype group to practice speaking skills.
3- My students are going off to a party to celebrate the student's day.
4- When I wake up in the morning I go in and look at my trees.
5- The nurse will join a voluntary group in Iraq. 
6- I had to set off early to avoid the traffic.
7- The policeman set off the alarm on   in the mall.
8- Scientifics  Scientists found out a cure for the zika virus. 
9- I would will find out the real reason why some women doesn't don't want to take contraceptive pills.
10- I was going to enrol in at the driving school but something came up and I couldn't.

Just the beginning

Hi Floria, welcome! Nice work - keep up the practice, and you'll be writing perfectly in no time :-)