As we can see, the prices of vegetables _____ according to the season.
| A．vary | B．fall | C．rise | D．reject |
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 |