Who can help me correct this exercise? Thanks very much.

In the innovating process of Economic integration, agricultural products of Vietnam appeared in many contries. It contributed to receive foreign currency to develop the country. Our advantage develops many exports of agricultural products have many. This is not only more difficult but also a disadvantage. If we (have suitable measure)? and determination,we can overcome that disadvantage.

You don't need to add a period after the ? though, you need one after the second sentence.

You need spaces after a perios and after a comma.

Examples:

I like dogs. They are furry

I am Vietnamese but, also American.

One more thing. I don't understand, "If we have suitable measure." I have a rough understanding of what you're trying to say but, a better way to say this would be, "If we take suitable procedures and have determination."

You could use the words "procedures" or the word "choices", in that case.

Sorry, for not correcting this way earlier. I never saw this on your profile, until now. >.<