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3. Even more serious difficulties include (冰凍天氣) conditions and heavy storms.

6. The baby pandas often die from (ill) .

() 3. is the population of the world today?

   A. How much   B. How many

   C. What   D. Which

() 10. Water pollution is a problem.

   A. serious   B. danger

   C. risk   D. strong

5. (趕快) ，the train is coming.

2. Tim saw the teacher (come) into the classroom just now.

() 10. Hurry up,the film for thirty minutes.

   A. began

   B. has begun

   C. has on

   D. has been on

() 6. My parents getting up early on weekends.

   A. used to   B. be used to

   C. was used to   D. are used to