The /uː/  sound is a long vowel sound in the English language.

Single syllable words: blue, clue, flu, glue, hue, new, pew, shoe, slew, through, true, two, you.

Two-syllable words: bamboo, shampoo, cartoon, balloon, baboon, resume, costume, consume, perfume, assume, presume, volume, argue, accrue, pursue, value, statue, vacuum, harpoon, raccoon, cocoon, typhoon, cartoon, canoe, issue, tissue, rescue, menu, pursue, accuse, confuse, refuse, imbue, debut, review, renew, attune, subdue, issue, tissue, rescue, menu, statue, shampoo, pursue, accuse, confuse, refuse, imbue, review, renew, approve, amuse, defuse, infuse, recluse, Tuesday.

Three-syllable words: avenue, barbecue, continue, revenue, interview, afternoon, disapprove, misconstrue, overdo, residue, revenue, tabulate, canoeist, introduce.

Multi-syllable words: superfluous, undergraduate, insubordinate, undervalued, retribution, renumerated, diluvian, overpopulated, revolutionize, elocutionist, intuitionist, refutation, tribulation, consummation, eulogium, circumlocution, undulating, ubiquitous, overstimulated, superabundant, rejuvenation, unscrupulous, euphoria, persecutor, quadruple, ingenuous.

Sentences: 

I reviewed the revenue and approved the menu at the barbecue venue.

The baboon took the shampoo and consumed it, causing confusion among the zookeepers.

The new statue in the park was quite impressive and caused a slew of tourists to stop and take pictures.

Through the blue shoes you wore, I got a clue about your flu symptoms and suspected you might need a new shampoo to deal with it. As you argued that you could consume any shampoo you wanted, I assumed you were trying to preserve the perfume of your hair. When I tried to convince you to pursue a natural remedy instead, you accused me of being confused and refused my suggestions. You also said you wanted to imbue your hair with a new scent and review all the shampoos available on the market. On Tuesday, you plan to introduce a new shampoo to your morning routine, and I hope it will be one that will continue to amuse you and approve of.