He refused________overtime to spend the evening with his family.

This ticket_______you to a free meal in our new restaurant.

Some people believe that_________ Chinese is an easy language to learn.

The word “perceive”in paragraph 4 is closest in meaning to

Which of the following is NOT true, according to the passage?

What does the word "they" in paragraph 1 refers to_______.

The discovery was a major_____ for research workers.

Deforestation result__________devastative floods in many parts of the world.

A. economics B. philosophy C. biology D. experiment

What can be inferred from the extinction of the dinosaurs in paragraph 2?