We _______ each other since I came to Changsha, but we often send emails.
haven’t seen
didn’t see
don’t see
The little boy sing in his room last night.
Teresa is nervous she can’t talk in front of the class.
— do you tell him about the news? —By an e-mail.
I used to to school by bike, but now I am used to to school.
There are some dangerous fishes in this river, and I’ve warned Jack here.