David's greatest problem is _______

The purpose of the passage is to ______

If you are in a foreign country, the best way the writer suggests to you is to wear .

The word “elements” is most similar to ______

The paragraph following the passage most probably discusses

It can be inferred from the passage that the ice would not be flat if ______

The word “elegant” is closest in meaning to _______.

If you visit an American friend at home in the evening, you may find that your friend wears

Negative publicity" in the passage most likely means .

The man mentioned in the passage, who used his cell phone too often,

Ten thousand years ago _____.

What is the main topic of the passage?

What does the passage mainly discuss?

The underlined word “sophisticated” in paragraph 1 can be best replaced by______.

According to the passage, cell phones are especially popular with young people because

The word "means" in the passage most closely means