It is difficult to ____ one twin from the other. They almost don’t ____ from each other.
| A．differ, distinguish | B．distinguish, differ |
| C．distinguish, different | D．tell, different |
So difficult _______it to work out the problem that I decided to ask Tom for some advice.
| A．I did find | B．did I find | C．I’ve found | D．have I found |
Seldom________as lonely as now though I have been living in Fuzhou for more than 20 years.
| A．have I felt | B．I had felt | C．I have felt | D．had I felt |
Only when their children leave home _________.
| A．many parents did feel a sense of loss | B．did many parents feel a sense of loss |
| C．did feel many parents a sense of loss | D．do many parents feel a sense of loss |
In front of me_______, where many athletes from all over the world will compete for Olympic gold medals.
| A．stands the Water Cube | B．stand the Water Cube |
| C．the Water Cube stands | D．does the Water Cube stand |
We are not born with courage, but_____ born with fear.
| A．we are neither | B．neither are we | C．we neither are | D．neither we are |