---Why you are so worried?
--- I ___for my little son all the afternoon, I don’t know why he hasn’t come back so late.
| A．am waiting | B．have waited | C．have been waiting | D．waited |
Only then _________the importance of my health.
| A．did I realize | B．had I realized | C．I realized | D．I had realized |
When ________ why she could speak English so well, she just smiled and said nothing.
| A．asking | B．to be asked | C．was asked | D．asked |
I want a picture of you. Would you give me ___________?
| A．one | B．it | C．that | D．the one |
In the future more stress should be placed __________ the education of the young.
| A．on | B．to | C．for | D．with |
It is uncommon that she is a person ___________up late .
| A．accustomed to stay | B．accustomed to staying |
| C．used to stay | D．addicted to stay |