______ the police thought he was the most likely one, since they had no exact proof about it, they could not arrest him.
Paper money was in _________ use in China when Marco Polo visited the country in _________13th century.
The audience was _____ very young children so there was a lot of noise while the concert was going on.
The chairman thought _____ necessary to invite Professor Smith to speak at the meeting.
She ______his number in the phone book to make sure that she had got it right.
You said boys were cleverer than girls. That is _______ I disagree.