To live a green life, we should remember to _________ the lights when we leave a room.
turn on
turn off
turn up
turn down
______is difficult to______ others.
Susan borrowed some books from me, but she forgot to ______them to me.
We decided not to climb the mountain because it was raining ______
--- I don’t know if it _____ ____ tomorrow. --- Well, if it _______, we won’t go for a picnic.
Do you remember ____when you heard about the important event? Yes, I do