They usually spend two hours _______ their homework every day.A. do B doing C to do
The teacher told us the earth ________ around the sun.
He’s been in China for two years. And he’s used to _______ in China.
_______ his help, we finished the work on time.
-___ __ have you worked? -Since 2 pm.
We can’t work out the physics problem. Can you tell us ________?