*Question*
The engineer put the new invention on the table in front of his bosses, he turned on his microphone and began his what of the product? Choose the most suitable option to answer the above question. Options：  A. stage  B. demonstration  C. record sound  D. parade  E. conference
**Answer**
B

*Question*
Where is homemade food often stored? Choose the most suitable option to answer the above question. Options：  A. supermarket  B. jar  C. backpack  D. wal-mart  E. container
**Answer**
B

*Question*
Where can you store a small notepad on your person? Choose the most suitable option to answer the above question. Options：  A. back pocket  B. meeting  C. drug store  D. home  E. school
**Answer**
A

*Question*
What problems do children have learning about the world? Choose the most suitable option to answer the above question. Options：  A. confusion  B. anger  C. sadness  D. loss of innocence  E. frustration
**Answer**
A