Don’t trust such people _____ praise you to your face but speak ill of you behind your back.
He is trying to shelter his boss ______ criticism.
The scientist knew nothing about the matter, because he was always ______ himself in his study.
Only three will be enough, so I needn’t take ______ of them.
People were ______ at his sudden death. It was really ______ to them.
It is reported that the floods have left about ______ people homeless.