. —John has put forward _______ most challenging question for us to answer.—Yes, it really is. I have never heard _______ harder one.
–I’d like to be on my own for a while. Do you mind?--________. Go ahead.
The police were seeking more information to find out______ the rich merchant.
Several weeks had gone by______ I realized the painting was missing.
Lucy has got into a situation in her study______ she finds it hard to go further.
The fact _______she had not said anything _______all of us.