Not until he left his home ______ to know how important the family was for him.
| A．did he begin | B．had he begun | C．he began | D．he had begun |
——There must be a dozen pens in this house but I can never find one when I need one.
——Keep looking. ______is sure to turn up.
| A．One | B．It | C．That | D．This |
Who can you turn to in time of danger, it not ________.
| A．any | B．us | C．we | D．ours |
——Which of the two books do you want?
—— I want_______. Please show me________.
| A．none; another | B．all; the other | C．neither; the other | D．neither; another |
Some people would rather ride bikes as bike ridding has_________ of the trouble of taking buses.
| A．nothing | B．none | C．some | D．neither |
The Parkers bought a new house, but_______will need a lot of work before they can move in.
| A．they | B．it | C．one | D．which |