_____ to improving services, we will provide customers with all the information they need.
| A．Being committed | B．Having committed |
| C．Committed | D．Committing |
---Excuse me, Sir, could you tell me how to go to the railway station?
---Sorry, you’d better ask, I’m afraid, ____ is a native.
| A．whom | B．who | C．whomever | D．whoever |
China’s first compulsory safety regulation on primary buses, which requires every seat to have a seat belt, will ____ on July 1.
| A．have an effect | B．take effect | C．bring into effect | D．come to effect |
With smart phones taking the world by ____ storm, a phone that can only send and receive voice calls and text messages may seem like ____ relic.
| A．a; a | B．the; 不填 | C．the；a | D．不填; a |
We ______ last night, but we went to the concert instead.
| A．must have studied | B．might study |
| C．should have studied | D．would study |
— What does the sign over there read?
— No person ______ smoke or carry a lighted cigarette, or pipe in this area．
| A．will | B．must | C．may | D．shall |