The fact has worried many scientists _____ the earth is becoming warmer and warmer these years.

The art show was ______ being a failure; it was a great success.

IkeptaskingMrSmithtostayforlunchandhefinally___________

the yard was an old man tellingstories, with quite a few children__________him.

_____ the police thought he was the most likely one, since they had no exact proof about it,they had to set him free