6．— Do you have Mary's address?
— Sorry, I don't have it ______ me at present．
A．to B．on C．for D．from
7．It is well-known to us all that knowledge is __ treasure, but practice is ___ key to it.
A. a, ∕ B. a, the C .the, the D. ∕ , the
8． —Hi, David, I heard you had an accident this morning．
—Yes．Luckily, I hit the brakes in time ______ I would have been injured badly．
A．and B．but C．or D．so
