Many people do not realize the importance of health___they have fallen ill.
A. until B．while C．when
–When _____for Australia, do’you know?
-I’m not sure. When he ______ . I’II let you know.
A. he leaves; leaves
B. will he leave; will leave
C. will he leave; leaves
When I walked past the park, I saw some old people______chinese Taiji.
A.do B.did C.doing
The children ______not to play with fire or go to the river without parents.
A. tell B. are told C. are asking
–Would you like to go out to play ping – pong with me?
--_____. But I should finish my homework first.
A. It's hard to say B. You are welcome C. I'd love to