How to use "tap" in a sentence

Together let us explore the stars, conquer the deserts, eradicate disease, tap the ocean depths, and encourage the arts and commerce.

He knocked at the door: tap, tap.

He then shut the door and got into the grandmother's bed, expecting Little Red Riding Hood, who came some time afterwards and knocked at the door: tap, tap.

This was the first time she'd ever had the need to tap those stores for herself.

Bruckster took advantage of the pause to tap his quarry on the shoulder.