How do homeowners determine the reliability of a house-sitter？
A. They attend a house-sitter"s party.
B. They check house-sitter"s references.
C. They interview house-sitter"s friends.
D. They look at house-sitter"s transcripts.
Which of the following can be a substitute for the phrase "emanate from"？
A. Thrive on.
B. Account for.
C. Originate from.
Descend from.
Why did the sugar cane farmers bring cane toads to Australia？
A. To enrich the variety of species.
B. To deal with cane beetles.
C. To balance the＞eco-system.
D. To strengthen the food chain.
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