It’s quite normal to ten percent of the cost of a building for a period of six months or so, in case faults are found in it.
| A．keep up | B． keep away | C．keep off | D．keep back |
If it is quite ________ to you, I will visit you next Tuesday.
| A．fair | B．comfortable | C．easy | D．convenient |
The trees _____ in the storm have been moved off the road.
| A．to blow down | B．blowing down | C．blown down | D．being blown down |
Only when I left my parents for Italy ______ how much I loved them
| A．did I realize | B．I realized |
| C．had I realized | D．I had realized |
Dogs have a very good_____ of smell and are often used to search for survivors in an earthquake.
| A．view | B．means | C．sense | D．idea |
Such a hard problem ________ that I ________ gave it up .
| A．was it ; eventually | B．It was ; suddenly |
| C．was it ; unfortunately | D．It was ; eventually |