.
Men will ________ all the natural resources if they continue consuming them like that.
| A．run out | B．wipe out | C．drop out | D．hold out |
We went through a period _____ communications were very difficult in the rural areas.
| A．which | B．whose | C．in which | D．with which |
I like getting up very early in summer. The morning air is so good ______.
| A．to be breathed | B．to breathe | C．breathing | D．being breathed |
On the north of the bank _____ the Opera House, _____ was built two hundred years ago.
| A．is lying; where | B．lies; what | C．lies; which | D．lying; that |
One learns a language by making mistakes and ________them
| A．correct | B．to correct | C．to correct | D．correcting |
________ on the top of the hill, you can enjoy a good view.
| A．Stand | B．Stood | C．Standing | D．To stand |