Mar Levine, ____ scientist at University of Pennsylvania, US, has found that competitive eaters have stomachs that can expand like ____ balloon.
| A．a; a | B．a; the | C．a; / | D．the; a |
How much bread is there?
-_____________.
| A．none | B．all | C．nothing | D．any |
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 |
Only _______ as an interpreter _______ how important it is to grasp English.
| A．when did I work; I realized |
| B．when I worked; I realized |
| C．when did I work; did I realize |
| D．when I worked; did I realize |
The physics teacher once said that we first _____the lightning followed by thunders because light ______ faster than sound.
| A．see; traveled | B．saw; traveled |
| C．saw; travels | D．see; travels |
You'd better _______ your score and see if you have passed the exam.
| A．add up | B．add to |
| C．add up to | D．add |