To live a green life, we should remember to _________ the lights when we leave a room.
turn on
turn off
turn up
turn down
George has put on weight recently. I think he’d better _______ too much.
My father is _______. And we just had a party for his _______ birthday last weekend.
一Excuse me, where can I exchange _______? 一There is a bank on the second floor.
Basketball is so popular a game in the world that ______ people play it for fun and exercise.
Don't be afraid of asking for help ______it is needed.