. ________ he realized it was too late to return home.
| A．Not until dark | B．It was until dark |
| C．It was not until dark that | D．It was dark that |
Online shopping is becoming _______ rising industry for China, as the country is ______ home to the world's largest online population．
| A．不填;the | B．a; the | C．the;不填 | D． a; 不填 |
It' s a pity that there are many teenagers _____only on-line activity is chatting with their e -pals !
| A．who | B．that | C．which | D．whose |
- Do you mind my opening the window?
-______I feel a bit cold.
| A． Of course not. | B． I would rather you didn' t. |
| C． Go ahead. | D．Why not? |
Father said he would come to my graduation ceremony, he didn't, _______.
| A．though | B．personally | C．indeed | D．anyway |
Be _____we can' t expect an absolute freedom of expression.
| A．confident | B．creative | C．grateful | D．reasonable |