____ wide spread of H1N1 is _____ challenge for the whole world. Confidence, cooperation and responsibility are keys to overcoming it.
Great changes ___ in the past ten years in China.
Many accidents _________ by careless drivers last year .
The book ___ to me is very interesting.
Millie gave ________ a baby cat yesterday that hurt _________ when it fell from the tree.
In the playground I saw a boy ___ I thought was your brother.