The cubicles felt like their own little rooms, you could hardly even see over the what? - square shape - doors and windows - apartment - border - high walls  The best answer is
high walls

What has a cash register with a limited items line? - bookstore - supermarket - toy store - candy store - shop  The best answer is
supermarket

If a person works hard how is their situation improved? - compliments acknowledgment - better life - american dream - complimented - headache  The best answer is
better life