As there is less coal and oil, scientists are exploring new ways of making use of _____ energy, such as sunlight, wind, and water for power and fuel.
| A．primary | B．alternative | C．instant | D．unique |
-We’re going camping this afternoon.
--Enjoy yourselves! Take a map with youyou get lost in the forest.
| A．so that | B．in case |
| C．as if | D．even if |
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 |