Fill in the correct German causal adverb?

Elena is an excellent teacher and a very nice person. I have been training in Spanish with Elena for quite some time now after her being recommended to me by a friend, and have consistently been very pleased with our lessons. While I do not consider myself to be very good at learning foreign languages, Elena is very patient and adapts the lessons to my ability, making me feel at ease. In fact, I find her to be extremely skilled at assessing exactly where I am at any given time with respect to my individual learning situation, and structuring the lessons accordingly. I think I probably would have given up trying to learn Spanish had I not began my study with Elena; and that would have been a shame considering where I am now with the language. Because of Elena's skilled help, I am extremely pleased to not only be conversant in basic Spanish, but also have confidence that I will one day reach full proficiency with the language. No other learning method I tried before meeting Elena compares to the one-on-one, personalized instruction I receive from her, which comprises reading; writing; developmental exercises; and most importantly, conversation. To be able to look at Spanish now and have it appear largely familiar is extremely satisfying. I even plan to study Italian with Elena after reaching my desired level in Spanish. These are not things I ever imagined would occur at the beginning stages of my studies. I am a native English speaker and find Elena's English to be excellent. She had no difficulty instructing me from the very beginning levels where it was necessary that a lot of English be spoken in our lessons, to where we are now with much less English being spoken. The friend who recommended Elena to me learned Dutch from her, and is equally pleased with their experience. I would not hesitate to learn from Elena any of the languages she teaches. I give Elena my highest recommendations and thank her for all the help she has provided me.

Hands down one of the best teachers I've had the pleasure of working with. Very knowledgeable in all aspects of Bulgarian (grammar rules, expressions, ...) but also in both English and French, which helps whenever you have a more in-depth question on the how or why something is the way it is in Bulgarian. Furthermore he has his own material and always comes prepared, but he is equally open to changing the subject of a lesson to suit your needs. He is patient, positive and not too scholarly, which is what you need as an adult learning day- to- day Bulgarian.I have been working with him for 18 months now and still look forward to our lessons every week.

We are an Italian family residing in France for 3 months, we have two 10 year old children who have just started attending CM1. We asked Natalia to give the children two lessons a week to speed up their learning. We are super happy with the choice. Nous sommes une famille italienne résidant en France depuis janvier, nous avons deux enfants de 10 ans qui viennent de commencer la CM1. Nous avons demandé à Natalia de leur donner deux leçons par semaine pour accélérer leur apprentissage. Nous sommes super contents de Natalia. We are an Italian family living in France since 3 months, we have two 10 year old children who have just started attending CM1. We asked Natalia to give the kids two lessons a week to speed up their learning. We are super happy with this choice.

I have had many lessons with Luisa and I always look forward to them. We begin by chatting about the past week's events and them move to Espresso which I find very useful as a good review of material I have done in the past. There is often additional words used I had not met before. Luisa is always a pleasure to talk with and is a kind and pleasant teacher. She corrects me gently and offers useful words or meanings when appropriate.

I had my first lesson a couple of days ago and everything went super good! Karin was attentive, transmiting her positivism and helping me with every doubt I had. She really focus on teaching how to pronounce and talk a language, so this is really interesting for me, to practise it & be able to use it in my day by day. I really recommend her to everyone willing to learn a new language :)

The lesson with Celia was perfect! She was puntcual, kind and her teaching method is effective and funny. She started the class with some "games" to get to know eachother and then we discussed about an article she provided. The time of the class passed really fast and I learned new vocabulary. Absolutely raccomended.