- How long _____ at this job ?
- Since 1990.
| A． | were you cmployed | B． | have you been employed |
| C． | had you been employed | D． | will you be employed |
How beautifully she sings! I have never heard＿＿＿＿．
| A．the better voice | B．a good voice | C．the best voice | D．a better voice |
If there were no examinations, we should have＿＿＿＿＿at school．
| A．the happiest time | B．a more happier time | C．much happiest time | D．a much happier time |
She is＿＿＿＿＿new comer to＿＿＿＿chemistry but she has already made some important discoveries．
| A．the； the | B．the；／ | C．a；／ | D．a； the |
Shortly after the accident, two＿＿＿police were sent to the spot to keep order．
| A．dozen of | B．dozens | C．dozen | D．dozens of |
These tables and desks are all made of＿＿＿＿＿．
| A．a wood | B．some wood | C．the wood | D．wood |