According to the recent research, Swine Flu hasn’t developed to the point no medicine can cure it.
It was not until all the fish in the pond died that________ the situation was serious.
Today acupuncture has become popular round the world, ________ have other traditional Chinese medicines.
People who tend to focus on ______ while speaking a foreign language may find that they worry too much about making mistakes.
Life is like _________ ocean; only ________ strong-willed can reach the other shore.
The two girls are so alike that strangers find________difficult to tell one from the other.