The computer in 1946 in America.
_____he is very tired , _____he still goes on working.
When we went into the park, we saw someone _____ Chinese Kungfu.
_____is watching TV. Let’s turn if off.
—Have you ever _____ Mudanjiang to see the Jingbo Lake? —Yes, I have.
You’d better speak aloud ______ we can hear you.