I'm wondering too. / I'm in suspense too. YES, although "I'm wondering" applies to a lot more questions than "I'm in suspense." The first is simply wanting to know the answer to something, while the second one implies you are in a highly excited/anxious state. "I'm in suspense" = "My brain has suspended operation", in a way. It's not that I don't trust you. / It's not because I don't trust you. YES, these are very interchangeable. It would only be a matter of preference I think.

PhD student is also correct. When I was in school, PhD student meant you were enrolled in the PhD program, but PhD candidate usually meant you were writing your thesis or going through defense. "Student" is less formal and more conversational in any case.

Yes, that is perfect. You often hear it reversed, as well: "Before you know it, we've grown up."

Possibly "tomorrow"? I don't think it's trademark, since no one can trademark the sentence, "I will talk."

Present Perfect

I am studying Present Perfect Tense. I wrote some sentences. Could you corret me?

1. I have been lived living in the USA for 7 months and I will be here until August
2.I have just left my house
3. I have just finished my project that I was preparing for long time.
4. My mom told me that she has changed her job.
5. I have never been to Paris although I have been to France many times
6. You have been to many places on in the world
7. My sister has ridden on horses many times.
8. I hate snow, it has snowed over three times this week.
9. This will be the first time I have driven so I am a little nervouse nervous.
10. I fell down from the stairs so I have had broken my leg

In this context, it means established deeply or firmly, like the roots of a tree. "Respect for the freedom of speech is rooted in American culture."

Revise my text, please. CAN YOU LIVE WITHOUT COMPUTERS?

Nowadays, the technology is present everywhere in our lifes lives, everywhere, for from purchases, to make making an appointment to the doctor a doctor's appointment, to work, to send sending letters and to make making a bank transfer.
The Internet and the new technologies make life easier for everyone. But also However, it is a danger tool if you don´t give it the correct use not used correctly. For example, when you chat with a person who you don´t know, you shouldn´t give personal information about yourself.
Personally, I use my computer to read books, to work and to chat with my friends. I can´t live without my computer!. But, in on the other hand, I think the technology becomes so necessary that can isolate us from other people like your family.

[if this is supposed to be more formal, replace "you" with either "one" or "his or her", and don't use contractions like "shouldn't" or "can't"]

"Stacked up" also means measured up or compared. "How does the new iPhone stack up to other smart phones?" "The new restaurant is not all it was stacked up to be." In this context, it is NOT interchangeable with piled up.