There is a new problem________in the popularity of private cars that road conditions need improving.
| A．involved | B．to involve |
| C．involving | D．being involved |
The shop assistant was dismissed as she was_______of cheating customers’.
| A．accused | B．charged | C．scolded | D．cursed |
No sooner______ themselves in their seats in the hall than the speaker began his speech.
| A．they settled | B．had they settled |
| C．did they settle | D．they had settled |
Achieving a high degree of proficiency(精通）in English as a foreign language is not a mysterious _______ without scientific basis.
| A．process | B．practice | C．procedure | D．program |
Generally speaking, if ______ strictly following the instructions, the electric bike is not as dangerous as reported.
| A．riding | B．being ridden | C．to be ridden | D．ridden |
On the National Day, up _____ into the air. Then the crowed cheered.
| A．the balloons went | B．went the balloons |
| C．go the balloons | D．did the balloons go |