Jiangsu Province ____ a series of activities to protect water resources over the past few months. Early this year, several cities ___ citizens to use new types of toilet equipment.
| A．organised; called for | B．has organised; called for |
| C．organised; has called for | D．has organised; has called for |
We can’t figure out ______ quite a number of insects and birds are dying out．
| A．that | B．as | C．why | D．when |
______ environmental damage is done，it takes many years for the ecosystem to recover．
| A．Even if | B．If only |
| C．As if | D．Once |
----- I'm going to San Francisco for a couple of days.
------ ________. I wish I could get away for a while.
| A．It doesn't matter | B．Forget it |
| C．I really envy you | D．I can't agree more |
It’s surprising that your brother _____ Russian so quickly—he hasn’t lived there very long.
| A．picked up | B．looked up |
| C．put up | D．made up |
According to scientists, our mental abilities begin to ___ from the age of 27 after reaching the highest level at 22.
| A．differ | B．shrink | C．fail | D．decline |