Choose the most appropriate Modal from the options given below to complete the sentence :

I _______ like to have a cup of water.

would

The most appropriate modal to complete the sentence "I _______ like to have a cup of water" is would.

The word "would" is used to express a polite request or a wish. In this case, the speaker is politely asking for a cup of water. The other options are not suitable for this context.

The corrected sentence is: "Would like to have a cup of water."