The program is like a window on the world ____ you sit by it and fix your attention on what it shows.
| A．if | B．as | C．while | D．unless |
【2015·北京】You won’t find paper cutting difficult _____you keep practicing it.
| A．even if | B．as long as | C．as if | D．ever since |
【2015·北京】He is a shy man,___he is not afraid of anything or anyone.
| A．so | B．but | C．or | D．as |
【2015·湖南】Video games can be a poor influence if ________ in the wrong hands.
| A．to leave | B．leaving | C．leave | D．left |
【2015·安徽】Some experts think reading is the fundamental skill upon______school education depends.
| A．it | B．that | C．whose | D．which |
【2015·江苏】The number of smokers, _____ is reported, has dropped by 17 percent in just one year.
| A．it | B．which | C．what | D．as |