Fill in the blanks:

1. Which one of the following events/accidents is a force majeure event....?

A, Exchange rate variation

B. Governmental prohibition of import/export of certain commodities

C. Change of shipping schedule

D. Commodity price fluctuation

2. The prerequisite to arbitrate a dispute is a(n)............... between the parties involved.?

A. sales contract

B. arbitration agreement

C. memorandum

D. transaction agreement

3. If an item is marked with "M" in the tariff, then the liner rate for this item is collected on......?

A, its unit

B. its weight

C.its capacity

D. its measurement

4.Some products like machinery, instruments, equipment and transportation tools are complicated in structure, thus........... is applicable..?

A, Sale by trade mark

B. Sale by brand

C. Sale by description and illustration

D. Sale by specification