The real-name system _______ train tickets will be sold based on real names is aimed to fight ticket-scalping, which has long been a headache for Chinese travelers.
| A．which | B．that | C．from which | D．in which |
The tower_____ in the 1800s is the oldest building in this area.
| A．to be completed | B．being completed |
| C．completed | D．Completing |
The computer system ____suddenly while he was searching for information on the Internet.
| A．broke down | B．broke out | C．broke up | D．broke in |
Linda was in____ dilemma when she was required either to complete the dangerous travel before____ deadline or to stay where she was forever.
| A．the; a | B．a; 不填 | C．the; the | D．a; the |
Every evening after dinner, if not ______from work, I will spend some time _____ my dog.
| A．tired; walking | B．tiring; to walk |
| C．being tired; walked | D．to be tired; walk |
Never before _____in greater need of modern public transport than it is today.
| A．is the city | B．was the city |
| C．has the city been | D．had the city been |