.Leonardo da Vince_____birds kept in cages in order to have the pleasure of setting them free.
| A．is said to be buying | B．is said to have bought |
| C．had said to buy | D．who said to have bought |
My house _____ when you visited Beijing last time, so I didn’t invite you to my home.
| A．was being decorated | B．is being decorated |
| C．has been decorated | D．was decorated |
She had to drop out of school _____ her family couldn’t afford the cost of her education.
| A．although | B．unless | C．because | D．so |
The old man has retired from the factory. He _____ there for 30 years.
| A．works | B．worked | C．has worked | D．was working |
—I don’t mind telling you what I know.
—You _____. I can manage it myself.
| A．mustn’t | B．ought not to | C．can’t | D．don't have to |
The decorations were so lovely that they _____ in a short time.
| A．sold out | B．has been sold out | C．were sold out | D．were selling out |