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 |
Bill Gates has created a wonderful “window” ______ people can surf the Internet freely．
| A．that | B．which | C．where | D．when |
—Where is Tom?
—Well, he______ you_______ here．Otherwise he would come down right now．
| A．didn’t know；were | B．hasn’t known；are |
| C．doesn’t know；are | D．hadn’t known；were |
—What do you think of the film 2012？
—Well, it’s good．At least it’s ______the one I saw last time with Jean．
| A．as bad as | B．not as good as |
| C．no worse than | D．not better than |
—Would you like more tea?
—No, , thanks．
| A．I’m well | B．I’m fine | C．I’m full | D．I’m thirsty |
Our bad living habits will destroy the earth．Only by changing ______ we live can we save the earth．
| A．that | B．what | C．how | D．where |