Jerry has promised to keep the secret, so he won’t tell anyone _____ asked to.
When was it ______ you met Yao Ming in the street?
How happy we _______, if you had come with us to the party.
It is required that no smoking ______ in the school.
The dress is not ______ for the formal party. You’d better find another one.
He was unable to make such progress, _______.