Modern science has found that _______ one is using chopsticks, over 30 joints and over 50 muscles are used, which is a favorable stimulation to the brain.
| A．since | B．although | C．unless | D．while |
Do you _________ or serve in an organization or are you a member of some group?
| A．simplify | B．require | C．sign | D．volunteer |
Since production has risen ________, the personal income has increased year by year.
| A．steadily | B．fortunately | C．particularly | D．variety |
From the ________ look on his face, I knew that he must have been threatened by someone.
| A．vivid | B．horrible | C．curious | D．terrified |
--- You didn’t have a good time at the party?
---- No, I ______ a lot from the noise made by the band.
| A．worried | B．suffered | C．heard | D．enjoyed |
The police are trying to find out the _______ of the woman killed in the traffic accident.
| A．status | B．identity | C．recognition | D．evidence |