—David has made great progress recently. —_____, and _____. Keep up the good work, Tom. A. So he has; so you have B. So he has; so have you C. So has he; so have you
--- We can use QQ to talk with each other on the Internet when you’re abroad.
--- Really? But can you tell me _______?
A. how I can use it B. how can I use it C. why can I use it