About Selfie Stick

I'm from mainland China. Recently, I had a chance to visit Macau, a former Portugal colony known for its reputation as the eastern Las Vegas--or should I say Las Vegas is the western Macau :). The first wierd thing I noticed is practically every tourist on the street, mostly mainlanders, was were holding a selfie sticks. I supposed this gadget was first invented to avoid the need to constantly harassing other people to take pictures for you, for convenience purposes. But I had to admit it's kind of a little bit (Note: Kind of or a little are both fine. But just choose one ^^) annoying seeing hundreds of selfie sticks at the same time with people obliviously posing in front of their cameras in all kinds of body positions. I had thought it was a typical Chinese characteristic thing (again, characteristic or thing are both fine, but choose one ^^), but it wasn't until last night when I accidentally clicked on a video clip of the David Letterman Show featuring Tom Hanks taking a selfie with David--also using a selfie stick!that Then I realized this trend really had caught on worldwide,although I haven't had time to watch that whole episode to obtain his actual opinion on this phenomenon. So what is your opinion on this little gadget? Is it just a fad or something that's going to last?

It depends on your relationship with that person. If it is a friend or someone that is of the same level as you, you can say "Thanks! I owe you one." Or for example if someone gives you something you didn't ask for but you appreciate the thought, you can say "You really shouldn't have." These are all informal. Formal ways or extreme ways of thanking someone are "I am very grateful for...(insert thing you are grateful for)." Or you can say "I really appreciate...(insert thing you appreciate them for)." Another way of formally thanking someone is to say "I am much obliged". being obliged is the feeling of being indebted to someone. But it's very formal and I might never say this word. The most safe way formal/or informal is "Thank you so much." "Thank you very much." or Thank you SO much" emphasis on the "so" or "very"

"I thought he is going to ask me" should be "I thought he WAS going to ask me". "Thought" is past tense so instead of "is" which is for a current situation, you should use "was". The rest of your sentences are fine.