______ environmental damage is done，it takes many years for the ecosystem to recover．
| A．Even if | B．If only |
| C．As if | D．Once |
Since 1949, the people’s living standard _______, causing a big _______ in population.
| A．has been raised; rise |
| B．has been rose; raise |
| C．has raised; rise |
| D．has raised; rose |
Going on a trip into___ space must be quite____ exciting experience.
| A．/; the | B．the; the |
| C．the; an | D．/; an |
To our anger, many poverty-stricken counties build luxurious office buildings instead of money to improve the miserable conditions of local schools.
| A．announcing | B．allocating |
| C．advocating | D．accumulating |
The ______, I think, he drew from his simple experiment is not scientific．
| A．conclusion | B．charge |
| C．promise | D．Relation |
—You know I dropped medicine and physics.
—You made a right decision.
| A．took up | B．took in |
| C．took apart | D．took off |