The author mentions food, tools and precious metals and stones together because they are all ________.
A. useful items
B. articles of value
C. difficult things to obtain
D. material objects
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—Has anyone seen my glasses？ —________.
A. Here it is
B. It is here
C. Here are they
D. Here they are
At least how many tests were carried out by the scientists referred to in this passage？
A. Three
B. Two
C. Only one
D. No one knows
It ______ him ten years to write that novel.
A. took
B. spent
C. cost
D. costed
Tom told me that you were going to take a trip to America, ？
A. wouldn’t you
B. didn’t he
C. weren’t you
D. didn’t you
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