What is the best way you think of ______ the environment?
The little girl is very shy. She _______ speak in public.
My grandfather have an old house in _____ they have lived for 70 years.
---It _____ ten years since we _____ last time. ---Yes. How time flies!
---Why don't you go hiking today? ----I prefer ______ at home to ______out because the weather is too bad.
---How many Chinese astronauts ______ into space since 2003? ----Twelve , including two women.