It was not until 1978_____ set free from the prison.
| A．that the old professor was | B．did the old professor |
| C．was the old professor | D．that was the old professor |
There are altogether eleven books on the shelf, __________ five are mine.
| A．on which | B．in which | C．of which | D．from which |
–---Dear me! I’ve been in America for a month.
-----________ you are settled, why don’t you take up some serious study ?
| A．If | B．Now that | C．When | D．Even if |
I was going to offer you some money but there’s _________ left on me.
| A．none | B．no one | C．nothing | D．no any |
Children under 12 years of age in that country _________ be under adult supervision（监管）when in a public library.
| A．must | B．may | C．can | D．need |
---–Who is the girl standing over there?
-----Well, if you _________ know, her name is Mabel.
| A．may | B．can | C．must | D．shall |