用所给的适当形式填空。
______ she ever ________ (be) to Beijing yet?
Help _______ (you) to some vegetables, children.
It is _______ (polite) to talk loudly in the class.
This is my _______ (two) visit to the UK.
写出下列动词的过去分词。
(1)speak —
(2)take —
know —
make _______