I'm so glad you will come to China!

我很高兴你要来中国！

I come from China. Welcome to China.

我来自中国，欢迎你来中国。

Do you come to China for the purpose of studying or traveling?

你来中国是为了学习还是为了旅行？

Hardly could I hold back my excitement when I heard that you will come to China.

听说你要来中国，我几乎无法抑制激动的心情。

That is why we have come to China as the strongest ministerial delegation ever to visit from the UK.

那就是我们作为英国有史以来最强大的部长级代表团到中国访问的原因。