_____entering the classroom, remember to take your seat and turn off your cell phone.
| A．At | B．From | C．Upon | D．As |
The Red Army men________25,000 li in the Long March.
| A．went |
| B．ran |
| C．walked |
| D．covered |
Learning to speak Chinese is a challenge, for it is often difficult for one foreigner to make himself easy________.
| A．understand |
| B．to understand |
| C．understood |
| D．understanding |
Different from________films which have brought him world fame, Zhang Yimou is so fascinated with the new film that he will put on similar show in________Lijiang City of Southwest Yunnan Province.
| A．the; the |
| B．the; 不填 |
| C．不填； 不填 |
| D．不填； the |
You're fortunate________such a good chance.
| A．for getting |
| B．into getting |
| C．to getting |
| D．in getting |
It's impossible________back the wheel of history.
| A．to hold |
| B．holding |
| C．held |
| D．to be held |