-Why does the Lake smell terrible?
-Because large quantities of water.
| A． | have polluted | B． | is being polluted | C． | has been polluted | D． | have been polluted |
Even if you are in rush, pushing someone so that you can get into an elevator (电梯) is just bad manners.
| A．a; / | B．the; the |
| C．a; the | D．the; / |
Remember to __________ a good state of mind even if you should fail plenty of times.
| A．take up |
| B．brush up |
| C．get up |
| D．keep up |
Mary has __________ herself __________ for the party.
| A．held; up |
| B．attended; to |
| C．done; up |
| D．turned; up |
I __________ the names of plants.
| A．familiar with |
| B．are not familiar to |
| C．am not familiar as |
| D．am not familiar with |
The bus was due to __________ at 5 p. m.，but it arrived one hour late due to __________ by the heavy fog.
| A．arrive; be held up |
| B．arrive; being held up |
| C．arriving; be held up |
| D．having arrived; having been held up |