—Why are you so depressed?
—I _____ my MP4 player on the bus．
| A．had lost | B．am lost | C．have lost | D．was lost |
Listening to peaceful music. as well as taking exercise,___________ a lot in relieving people 's sad emotions.
| A．help | B．helped | C．helps | D．are helping |
The man__________has made up his mind to win will never say "impossible".
| A．whom | B．when | C．which | D．who |
Only when___________ according to the directions can the medicine be quite effective.
| A．taking | B．taken | C．being taken | D．having been taken |
To be successful, you need to remember that ___________you might be very busy, you need to be energetic and enthusiastic.
| A．as though | B．in case | C．even if | D．now that |
Not until all the fish died in the lake __________ how serious the pollution was.
| A．did the villagers realize | B．the villagers realized |
| C．realized the villagers | D．do the villagers realize |