もう一杯機嫌だね。
You're lit up like a Christmas tree.

フォークが食事用として一般に使われ始めたのは、紀元後１０世紀のことであった。
The general use of forks for eating started in the tenth century A.D.

先進国では虫歯が激減し、自分の歯で一生食べられる人が増えています。
Cavities have become rarer in the developed countries and more people will be able to eat with their own teeth throughout their life.

私たちの先生はごきげんです。
Our teacher is in a good temper.