They are_________ to eat Chinese food though they have been in America for years.
The hall __ we saw the film was very clean.
--Let us see your pass, ___. ---Sure.
I can't __ the difference between them because they look like the same.
He ___ work in Hangzhou, did he?
Do you know __ to deal with this kind of person? A, how B. which C.what D. that