The place _____ the bridge is supposed to be built should be _______ the cross-river traffic is the heaviest.
| A．to which; where | B．at which; where |
| C．by which; in which | D．for which; which |
．The boy wanted to ride his bicycle in the street，
but his mother told him______．
| A．not to | B．not to do | C．not do it | D．do not to |
. She pretended ______ me when I passed by .
| A．not to see . | B．not seeing | C．to not see | D．having not seen. |
．Mother ______ us stories when we were young .
| A．was used to tell | B．is used to telling | C．used to tell | D． used to telling |
·______down the radio ______ the baby's asleep in the next room．
| A．Turning | B． To turn | C．Turned | D． Turn |
．Charles Babbage is generally considered ______ is the first computer．
| A．to invent | B．inventing | C．to have invented | D．having invented |