When he the dog on the street, he saw the accident.
Mr. Wang made up his mind to devote all he could ______ his oral English before going abroad.
Influenza HINI is an illness that can result in death unless ______ in time.
MSN, ______ you can chat with your friends, makes communication easy.
Mother's love is true love! She's never stopped loving you ______ you become or you do.
The dance performed by the disabled actors is really a hit, but years ago no one ______ they were to achieve such great success.