-- Could you tell me something about the boy who helped you just now? -- Sorry, I know nothing about him. We are______. A. friends B. strangers C. classmates
_____he is very tired , _____he still goes on working.
When we went into the park, we saw someone _____ Chinese Kungfu.
Imy homework, I guess I can't join you.
What can we students do _____ the environment?
—Would you like to have _____? —No, thank you. I’ve had enough.