Barron's TOEFL H

Verb cause to stop temporarily or permanently
A group of elite mercenaries, the Expendables, are deployed to the Gulf of Aden off the coast of Somalia to halt local pirates from executing the hostages.
Verb be in charge of or act on
Lady Gaga has asked her fans to stop sending online threats to her critics. The pop star said she would not condone "hateful or abusive language," adding "this is not a healthy way to handle your emotions."
Verb house or protect
harbor
It turns out your belly button is like a rainforest, at least in terms of biodiversity. Scientists hope to clarify what the thousands of microbes that our navels harbor are doing, and why they're there in the first place.
Verb gather a crop
African women are slowly gaining financial control over the coffee farms they harvest and maintain. The goal of the IWCA is to empower these women by providing mentors and bringing them together in cooperatives.
Verb cause (something) to happen sooner than it otherwise would
When the Nationals drafted Harper, they declared he would turn from a catcher to an outfielder to hasten his ascension to the major leagues by end of 2012.
Adjective potentially very dangerous, involving risk
The Boston-based company Bounce Imaging is developing a ball-shaped camera that can be thrown into hazardous, unseen places, and send back a full panoramic view of its surroundings.