Verb conjugation of "klingen" in German

The current situation in Libya is really difficult. I tried to get in contact with acquaintances, but all the phones were not working. I'm really concerned about their well-being. I'll try again later.
Choosing the right language school is not an easy task. If you want to learn Spanish for example, you first need to know which country you should visit, because the pronunciation in each country differs.
I have made an internship at a law office, but just for two months. Their salary is really bad. Now to my promise to correct your long message. You need to say: 'On Friday' not 'At Friday'.