When _______________ comes to saving energy, big changes start with small steps, like turning off the lights.
—— Do you mind my opening the window? It’s a bit hot in here. —— , as a matter of fact
21. ---It looks heavy. Can I give you a hand?---_______.
—Sorry, do you mind if I smoke here? —Yes,
-----Ken, , but your TV is going too loud. -----Oh, I’m sorry. I’ll turn it down right now.
It is only by practising English for several hours every day _________ be able to use it freely.