Read this story, _______ you will realize that not everything can be bought with money.
—Did you have any difficulty catching yesterday’s lecture? —No. The professor spoke very clearly to make his speech easy _____.
After months of voyage, Columbus arrived in _____ later proved a new continent.
—Do you think our team will win the game? —I don’t know. But this is the last chance. We _____ them to.
____ our natural resources is very necessary.
_____ is known to us all is that the old scientist, for _____ life was hard in the past, still works very hard in his eighties.