Eton College in England was ______ in 1440 by King Henry VI to give free education topoor students.

Mum,my little sister is crying all the time. ——Mary,be _________!She feels sick.You should take good care of her.

Tom, what classes do you have every day?—Well, Mom, we have English, math, Chinese and some ______ classes.

下面哪一组字母的顺序是正确的。

If we ______ take environmental problems seriously, the earth _______ worse and worse.