下列句子中，没有语病，句意明确的一句是(3分)

He is going to build a team that has a lot of potential and he thinks that is ____ excites him.

4 Mr Smith ______ that he had made amistake and that he had corrected it

________ milk is ________ your health.

1Jack is a famous writer. ＿＿＿new book is very popular.