— ___________ do you watch TV every day? —For about half an hour.
---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.
---Who helped you clean the classroom yesterday?---_______. I did it all by myself.
I remember ______ the math problem ______.But I can’t remember it’s answer.
It’s said that _____ of the water around the world _____ polluted.