（2007年浙江省第二次五校联考，8）How long do you think ___________ the Microsoft brings out a new product?

______ Tom be in his office so late at night ?

Since my return to China, I haven’t seen my host mother in America; nor______from her.

Tom’s uncle knows computers well, and he __________ a computer engineer .

How would you likeif you didn’t see me for two or three days?