--How long are you staying ?
-- I don’t know . ______.
| A．It depends. | B．That’s OK. | C．Never mind. | D．It doesn’t matter. |
I'm sorry but what he thinks is not of the _____ importance to me.
| A．merest | B．lowest | C．last | D．least |
Animals should not be locked in cages; they should be in their normal _____.
| A．environment | B．position | C．residence | D．dwelling |
The lady who had invited us heard me telling my wife that the dinner was terrible so I was _____.
| A．confused | B．nervous | C．shameful | D．embarrassed |
Air and the sun's rays create much distortion, and whatever tends to _____ their influence is useful to the astronomer.
| A．exclude | B．eliminate | C．extinguish | D．impose |
The filling station _____ because there were too many others on the street.
| A．fell through | B．went under | C．fell out | D．went through |