Passage Two
Questions 29 to 31 are based on the passage you have just heard.

A. To cancel his trip.
B. To go to bed early.
C. To catch a later flight.
D. To ask for a wake up call.

A. To check the accuracy of scales.
B. To calculate the density of other metals.
C. To observe changes in the atmosphere.
D. To measure amounts of rain fall.