If Khalid (keep) smoking, he (damage, eventually)  his lungs.( grammer ) ​

keeps

will damage

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#Captainpower

The proper grammar for this sentence is:

If Khalid keeps smoking, he will eventually damage his lungs.

Explanation:

I hope I understood your question correctly. Sorry if not.

a. "to practice" is the best phrase to complete the sentence.

explanation:

during the summer, she likes to practice her soccer skills so that she is ready to play in the fall.

(note that : all the other options "the practicing of", "practice for" and "to do a practice on" are inappropriate as they make the sentence grammatically incorrect.)