--What’s this in the blue box? --________is an orange bottle. _______ orange bottle is mine .
---Did you get there by ______ bike? ---No, I took ______ taxi.
—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.