Shanghai is a beautiful city. I _____ there twice .A. went B. have gone C. have been
---Look at the boy running on the playground. Is it David? ---It ______ be him. I saw him go to the teachers’ office just now.
---How long __________ your parents ___________? ---For about twenty years.
The weather in Hong Kong is quite different from __________ in Beijing.
What_____you_____at nine yesterday morning?
Jim is____ honest boy. We won’t play _____chess with him any more.