____ wide spread of H1N1 is _____ challenge for the whole world. Confidence, cooperation and responsibility are keys to overcoming it.
He jumped out of bed and ran to the door to see ________ the parcel was for.
It is important to introduce children to healthy nutritious foods from ________ they begin to eat solids.
Suppose we meet with a situation ________ none of us can deal with, what then?
It is announced that big prizes will go to ________ finishes the assignment on time.
It remains to be seen ________ the newly formed committee's policy can be put into practice.