John’s father went to Nanjing ________ten days ago.
| A．on duty | B．in business |
| C．on business | D．on show |
I __________ Beijing three times, I know there very well.
| A．went | B．have been to |
| C．have gone to | D．have been in |
To my surprise, the tiny person is ___________my little finger.
| A．the same big to | B．the same size of |
| C．the same size as | D．the same big as |
Linda doesn’t know __________about her problems.
| A．who to talk | B．where to talk to |
| C．who to talk to | D．how to talk to |
The train is running _____the speed of 200 kilometers per hour.
| A．with | B．at | C．in | D．For |