用所给词的适当形式填空。

1. Your father look very _________ . (health)

2. I think this book is the _________ (useful) of all.

3. He bought some Chinese _________ (paint) yesterday. He liked them very much.

4. Let's talk about English _________ (teach) in Japan.

5. Yesterday a _________ (foreign) came to our school.

测定含有碳酸气的果蔬汁饮料的氨基酸态氮含量，应先除去试样中的二氧化碳气体再测定。