Paper produced every year is the world's production of vehicles.
| A．the three times weight of | B．three times the weight of |
| C．as three times heavy as | D．three times as heavier as |
_____ worries me is _____ we’re going to pay for all this.
| A．It, that | B．That, how | C．What, how | D．As, that |
I’m afraid we can’t have coffee; there’s _____ left.
| A．nothing | B．none | C．no one | D．no any |
The classroom is almost empty, where is _____?
| A．someone | B．anyone | C．everyone | D．no one |
Don’t go to _____ places where there is no fresh air.
| A．such | B．so | C．those | D．which |
Energy is ____ makes one work.
| A．what | B．something | C．anything | D．that |