①Where is Jane?                                     A. So do I.

②Have you been to the museum?             B. About 4 million.

③I hate going to the shopping centre.      C. She has gone to the library.

④What's the population of our city?       D. So they are.

⑤Pandas are the cutest of all.                   E. No, never.

    As we know, the world has a population of 6.8 (billion/billions) and it is increasing (by/to) 80 million every year. China has already (reach/reached) 1.3 billion, so it has the largest population in the world. It’s reported that the population in developing countries (is/are) larger and is growing faster than (those/that) in developed countries.

As a result, the population problem has become more serious in (developing/developed) countries. 

—No, I just (have) some orange.