The boy is ______to go to school..
| A．enough old | B．young enough | C．old enough | D．enough young |
There is a big tree ______ the house.
| A．in the front of | B．at the front of |
| C．in front | D．in front of |
What happened while Linda was ______ the telephone?
| A．in | B．at | C．on | D．into |
What ______ you ______ when you father came back?
| A．did, do | B．are, doing | C．were, doing | D．do, do |
The woman couldn’t see her son____.She was worried.
| A．somewhere | B．everywhere | C．anywhere | D．where |