Guess multiple Answers (game)

I've got more riddles as in my previous post was answered immediatly. Hehe.

Everyone will only have one guess, if it is incorrect, you pass on. (Makes it more fun for everyone) 

1. I’m cheap to make and easy to define.

A riverbank could populate the line.

What am I?

2. What is a surprise party without any cause for celebration?

3. I am one in China,

Two in Indonesia,
Three in the Philippines,
None in Japan.

What am I?

4. You eat something you neither plant nor plow.
It is the son of water, but if water touches it, it dies.

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Good luck everyone remember you only have one chance at every question, internet is not allowed xd

1' A Line

2' Someone jumping out of a bush and mugging you.

3' The Letter I

4' Ice - Answer by @CMO Jackdevo

Louie Austino said:

1' A Line

2' Someone jumping out of a bush and mugging you.

3' The Letter I

4' Ice - Answer by @CMO Jackdevo

Click to expand...

1. Almost correct.

2. Possible but you may redefine that answer.

3. Correct ✔

4. Almost correct, I am looking for another answer, very close to be honest.

Barb Dwyer said:

1. Almost correct.

2. Possible but you may redefine that answer.

3. Correct ✔

4. Almost correct, I am looking for another answer, very close to be honest.

Click to expand...

1. boundary?

2. Ambush

3. I

4. Salt

Sonder said:

1. boundary?

2. Ambush

3. I

4. Salt

Click to expand...

Solved. Bloody hell