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I am surprised with his sudden visit.

I am surprised by suddenly increasing the economic growth rate in our country.

Are these sentence correct?

Comments  

I am surprised by his sudden visit.

I am surprised by the sudden increase in the economic growth rate in our country.

Are these sentence(s) correct?

I'm not an English teacher, but I think the first sentence should be:

I am surprised by his sudden visit.

and the second sentence should be

I am surprised by the suddenly increasing economic growth rate in our country.

One more thing. The question you are trying to ask is "Are these sentences correct?" The 's' makes sentence plural because there is more than one sentence.