.
—Must I turn off the gas after cooking?
—Of course! You can never be__________careful with that.
| A．enough | B．too | C．so | D．very |
Our school has developed a learning systemstudents can do a lot of teamwork.
| A．that | B．when | C．which | D．where |
-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 |