— What made Bill so angry? —____________. His girl friend promised to come at 8:30, but she hasn’t come yet.
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