I need one more stamp before my collection _______.
He spent too much time talking on ______ phone while we were all busy at _____ work.
As is known to us all, _____ tiger is in _____ danger of becoming extinct.
This is _____ best kind of _____ pen you can get here.
How strange! These years my birthday always falls _____.
They promise that the work would all be finished _____ next week.