Thanks to for the Oppo company.

First of all and foremost, I'd like to thank Oppo Mobile for their smartphones and accessories and  for making this amazing event happen.
And I would also like to thank them even   all the more for their heartwarming welcoming.
I really hope that in the future, we'll be assisting a similar event in the mother country of Oppo Enterprise, China.
In the name  On behalf of all the other distributors that I have been chosen to represent, I'd like to thank you once more for your hard work that can be clearly seen in the quality of your products.

*(First of all is appropriate for conversation, but here its too casual).

I like lost.I'm not a teacher, but I used to correct and edit scholarly work. If you are are writing something serious like a review, the conjunction "while," should never be the first word. 

You should have your first sentence formulated into a strong topic sentence. 

If you say, "I jumped on the bandwagon for watching," you will notice that it cannot stand on its own and is not so great.  

by asking questions such as  >>makes your sentence run smoothly and such as is equivalent to the colon (:) that you previosuly used.

While I was Originally, I was reluctant to jump on the bandwagon for watching  for the series “Lost." Yet, it was when I accidentally watched one an episode of season 1 that I got totally hooked on this series and since then I have become a great fan and defender of it. 

Lost is a six season length drama series containing a clever combination of science-fiction, action and romance. It takes the simple idea of a passenger flight full of unknown people crashing onto a tropical island somewhere in the South Pacific Ocean. However, by making a brilliant use of the flashback and flashforward narrative technique, it gradually adds extraordinary depth to its premise by exploring each character deeply by asking questions such as who are they? Where did they come from? What drives them? It soon becomes clear that the island acts as a common denominator for all them.
Admittedly, it can be said that the Island itself is a living character alongside with the mysteries it houses holds: from the spooky black smoke to the enigmatic ancient buildings or the strange previous inhabitants mysteriously known as “the Others”

The following sentence is a run on sentence... when you wrote even though, I was expecting a real contrast. 

Even though In addtion to the dozens of elements that make of “Lost” a unique and must-see series that on no account should anybody miss out:  one should miss, the incredible cast, the inspiring scenery of an unspoiled island, the characters... the storyline is by far what outshines the others. When some of your questions are answered watching one episode, ten more are raised in the next. It is also worthy of special to make an honorary mention the controversial season finale that whether eventually you like it or not, it won't you leave you indifferent.

If you are a great fan of the thought-provoking series “Lost,” this should be, beyond doubt, at the top of your list. I strongly recommend it to you.

Ma réalisation

Bonsoir, aujourd’hui je me suis réveillée bonheur. Il était environ six heures du matin. Quand j’ai vu quelle heure il était, je m’a débrouillée retourner à dormir. Cependant, ma mère est allée travailler environ à l’heure susmentionnée.
À midi, je suis allée à l’église assister la messe. J’ai vu mon amie Claudie. Elle est une vieille dame qui parle le français très bien. En français, j’ai essayé lui dire <<mère est allée travailler.>> Mais, je me débattais. Cela, m’a fait sentais malaise. Immédiatement, je pensais il faut que j’écrive la plus souvent que possible. Donc, après j’ai eu cette bonne idée, j’ai fait mes courses, j’ai mangé deux tranches des pains avec du fromage suisse (américain) et me voici!
Je dois dire, je me sens comme s’il est très difficile à écrire en français, spécialement sans mon portable et son traducteur.