He failed in his business a third time and only then ______ the difficult situation he was in.
| A．I realized | B．I had realized | C．had I realized | D．did I realize |
The child complained that the old man made no answer whenwhere he lived．
| A．asking | B．being asked | C．having asked | D．asked |
“The day is coming _____telegraph wires will be _____on to houses just like water or gas.” He said in his letter to his father.
| A．that; lay | B．that; laid | C．when; laying | D．when; laid |
_______ she finds out that you’ve lost her book?
| A．What about | B．How about | C．How if | D．What if |
It is ______ great pleasure to meet the expert who is doing research on _________ archaeology.
| A．/ ; | B．/; the | C．a; the | D．a; / |
People who cannot _____ between colours are said to be colour-blind.
| A．distinguish | B．compare | C．contrast | D．distribute |