________is it from the Children's Palace to Nanjing South Railway Station， Tom？
About 10 minutes' ride by bus．（ ）
A．How soonB．How longC．How farD．How much
By the time he was ten, Edison _________ experiments in chemistry.
| A．had already done | B．already had done |
| C．was already doing | D．already did |
It was the first time in my life that I _________ the Great Wall. You can’t imagine how excited I felt!
| A．had visited | B．visited |
| C．visit | D．have visited |
By the end of Last year, we _____ more than 1,100,000 cars.
| A．were producing | B．produced |
| C．had produced | D．would produce |
— Did you borrow the comic book from the library?
— Yes. I ________ it for three days. I’ll return it this afternoon.
| A．borrowed | B．had kept |
| C．have borrowed | D．have kept |
—Tom, why did you make no reply to me when I called your name in the street just now?
—Sorry, Jim. I ________ to my wife on the phone.
| A．talked | B．was talking |
| C．am talking | D．had talked |