The development of industry has been ____ gradual process throughout ______human existence, from stone tools to modern technology.
| A．/, the | B．the, a | C．a, / | D．a, a |
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 |
Sometimes people just believe what they see, ______the reality may be different.
| A．as if | B．even though | C．since | D．unless |