Martin and his friends didn’t eat up all the food they ordered, __ they took the rest away.
It’s difficult for such a girl to swim ____ the river.
—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.