用所给词的适当形式填空。

小题1:Tea ______ (leaf) are produced in the south of the Yangze River.

小题2:Could you tell me how ______ (pronounce) the new word?

小题3:Twenty dollars ______ (be) enough.

小题4:He spent the rest of his life _______ (teach).

小题5:Tom writes his homework as _____ (care) as Maria.

词汇是一种语言里所有词的总和。