I didn’t have money for a taxi, so I had to walk back home.

Mum, my trousers are too old. I want to buy a new ______.

It’s very important for us to learn how to learn by        .

---Which would you like to eat, bread or sandwiches?  ---___________. Please give me some dumplings.

 ---We can use QQ to talk with each other on the Internet.---Really? Will you please show me         it?