We can’t work out the physics problem. Can you tell us ____?
—Would you like to go out for a walk with us? — ,but I must finish my homework first.
I usually sleep with the window open _____ it’s very cold.
We have to _________our school trip till next week because of the heavy rain.
The light is on in Mr. Green’s room. He _______ be at home.
A new supermarketin my hometown last month.