It is the prevention of disease ________ its successful treatments that has led to the rapid increase of the world’s population.
After the earthquake,the first thing the local government did was to provide________for the homeless families.
It's __________ comfort to know there is someone to keep __________ eye on the kids.
Now what we need is something __________ will make human beings live better.
—Would you like to play bridge with us? —Sorry. __________.
Please let me know __________ you want to go or not.