15．The most satisfying life is a life__________you know the things you’re interested in and pursue （追求）it for your own.
| A．which | B．where | C．that | D．What |
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 |