The boy ______ a piece of waste paper, and put it into the rubbish bag.
— _________ did you do with old books?— I sent them to children in poor areas.
— What______useful dictionary for beginners of English! Where did you get it?— I bought it in the bookshop.
— I visited the Purple Mountain Observatory last Sunday.— Why didn’t you tell me earlier?
There’s milk in the fridge. Let’s go to buy some .
Is the computer ? We don’t have to buy it .