At present, computer knowledge has become ___________ requirement as the ability to read and write.
He doesn’t visit Mr. Black___.
It was in the house ___he used to live that the exhibition was held.
he said he would ring me up, but he didn’t ___my telephone number?
Of all the students , ____ is so diligent as George.
If he had been taken good care of at that time, the boy ___ now.