Studies show that daydreaming contributes significantly to concentration powers and the ability __________ with others.
You may go out ___ your work is done.
He had promised to come and help us, and ___.
I don’t have time to come to your house, but I could ___ at the end of the street.
He doesn’t visit Mr. Black___.
It was in the house ___he used to live that the exhibition was held.