— Shall I go and buy two more bottles of beer?
— No, I’ve already bought twenty. That _____ be enough for us two.
| A．can | B．may | C．ought to | D．might |
It's only six o'clock now；little Tom should be up，though，because he________for nine hours.
| A．has been sleeping |
| B．had been sleeping |
| C．has slept |
| D．had slept |
—Have you met Mr.Li?
—Yes.When I arrived，he________for Shanghai to attend a national conference.
| A．just left |
| B．had just left |
| C．just leaves |
| D．was just leaving |
—Hey，John！I________to meet you here.
—Oh，yes.This is my first time to be at the Internet café.Do you often come here?
| A．haven't expected |
| B．wasn't expecting |
| C．hadn't expected |
| D．didn't expect |
ln the struggle of fighting against _______ nature, _______ man created itself.
| A．the; the |
| B．/; / |
| C．a; the |
| D．/; the |
It is suggested that the key _______ the world's environment should be _______ a low carbon economy right now.
| A．to protect; to expand |
| B．to protecting; to expand |
| C．of protecting; expanding |
| D．to protect; expanding |