______ the police thought he was the most likely one, since they had no exact proof about it, they could not arrest him.
Do you know who our teacher will have ________ an article for the wall newspaper?
Little _______ that the region was rich in natural resources about four decades ago.
—Shall I pick you up after school this afternoon? — ________, if it’s convenient to you.
The purpose of a class is to teach you to think creatively and not to follow your teacher_________.
With lots of problems ________ in the class, our teacher looks very relaxed and happy.