Unitl tens of years ago, most zoos in such a way—animals in one area and birds in another.
| A．were organized | B．had organized |
| C．will organize | D．have been organized |
You cannot accept an opinion ________ to you unless it is based on facts.
| A．offering | B．to offer | C．having offered | D．offered |
Do not let any failures discourage you, for you can never tell ________ close you may be to victory.
| A．how | B．that | C．which | D．where |
— Have you heard about the recent election?
— Sure, it ________ the only thing on the news for the last three days.
| A．would be | B．is | C．has been | D．will be |
If nothing ________, the oceans will turn into fish deserts.
| A．does | B．had been done | C．will do | D．is done |
The sun began to rise in the sky, ________ the mountain in golden light.
| A．bathed | B．bathing | C．to have bathed | D．have bathed |