Only when it is hungry ______ a human being.
| A．a lion will attack | B．a lion should attack |
| C．will a lion attack | D．should a lion attack |
We all need knowledge from the past — ______ it comes from personal experience or from studying history. It is our only guide to the future.
| A．as | B．whether | C．how | D．when |
The patient has tried quite a few kinds of medicine, but ______ had any effect on his disease.
| A．none | B．nothing | C．neither | D．no one |
I wouldn’t eat potatoes unless I’m really starving, in _______ case you eat almost anything.
| A．whose | B．one | C．what | D．which |
One of the consequences of our planet’s being warming up is a(n) ______ in the number of natural disasters.
| A．account | B．reason | C．increase | D．occurrence |
World Expo 2010 Shanghai China, a grand-scale global event, has ______ the significant theme “Better City, Better Life.”
| A．abandoned | B．adopted | C．advocated | D．adapted |