Barron's TOEFL S-1

Adjective lacking serious thought
Web and Facebook games are usually free, with the option to buy enhancements. Industry veterans argue you get what you pay for: mobile apps that are shallow entertainment experiences compared with those of console games.
Verb to lose (leaves, skin, fur, etc.) naturally
Similar to a poodle, the dog sheds very little. Actually dead hair is tangled in the dense fur. This kind of fur is called hypoallergenic.
Phrase make clear or supply additional information
shed light on
Upon his death, Albert Einstein's brain was photographed and dissected into 240 parts. Scientists are now looking through the material for anatomical quirks that would help shed light on the physicist's genius.
Noun underskirt or dress with little shaping
I don't see Peeta in the morning. Cinna comes to me before dawn, gives me a simple shift to wear, and guides me to the roof. My final dressing and preparations will be alone in the catacombs under the arena itself.
Adjective not convinced that something is true
In a case considered pivotal to the future of science and medicine, the justices of the U.S. Supreme Court seemed skeptical Monday about a claim that human genes can be patented.