Sentence Practice - One

你喜欢蔬菜吗 is OK，usually we say 你喜欢吃素吗？ instead. 吃means eat and 素means vege

I prefer to say 饭店有好吃的。饭店 has the same meaning as 饭馆.  好吃的 means delicious food. It is informal and used when speaking.

他要日本菜。 He choose to have Japanese food. If want to express that he wants to eat Japanese food. I would like to say: 他想吃日本菜。我们都有茶 means： We've got tea already. I'm not sure and I guess maybe you intend to say: We want to order tea. In the case, you could say: 我们都要茶。