15. The biplane was used during World War II.
a. plane with two wings on each side C. plane with two wings on each side
b. jet plane
D. helicopter
16. The post mortem examination showed that the man was poisoned
A. An examination before the death.
C. An examination after the death
B. An examination at the last hour of death. D. An examination during the operation
17. The neighbors misiudged the intention of Mrs. Nevada,
A. Had a good impression
C. Had a bad impression.
B. put in prison
D. gave a gift​