____ is clear ____ the Diaoyu islands have been China's inherent territory （固有领土）both from historical and legal aspects since ancient times．
| A．That; that | B．This; this | C．It; that | D．What; what |
He offered to _____ her a hand as the suitcase was too heavy for her to carry.
| A．lend | B．help | C．show | D．loan |
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 |