________you like the portable personal computer so much，why not buy one?

We don’t doubt _____ he can do a good job.　　

Liping has never gone to Japan, but he speaks Japanese____ he were Japanese.

 We know _____America is great not because it is perfect but because it can always be made better and _____ the unfinished work of perfecting the union falls to each of its citizens.

I haven’t read the book for __________ long _______I’ve forgotten what it is about.