When did you become a volunteer for the elderly?– Two years ago. I this group since then.
Are you going to Shanghai by train?—No. I’m taking car.
If giant pandas have no food, they . If we do not protect giant pandas, they .[ ]
Why don’t you ask him for help? You _____ be good friends.— We have disagreements and we haven’t talked to each other for a long time.
Have you _________ the story before?