These Maths problems are too hard to ______. Can you help me?—There are many ways, but the most important is to try your best.

I can’t remember how many years ago _____ a fight broke out between the husband and the wife.

__________ the stars are, the smaller they look, as is known to all the people.

Have you ever seen ____ pen? I can’t find my pen anywhere. –Is it ____blue one? It is under the book.

What do you think of the lion? －Well, I think it’s _____ ugly animal.