It is uncertain____side effect the medicine will bring about,although about two thousand patients have taken it.
Only when his mother arrived ___________.
–Do you know the ____ woman by the chairman? --Yes. But could you introduce to me the man _____ by the reporters?
Suddenly it ____ me that if I let him go, he would never come back again.
They often change the kind of crop in each field ____ few years, for example, growing corn or wheat and then the next year peas or soybeans.
____ little tramp was ____ social failure but was loved for his optimism and determination to overcome all difficulties.