构成教育活动最基本的因素有( )。

单项选择题Food products containing chocolate are subject to a () of up to 35 percent when imported to Japan.

A. test
B. tariff
C. souvenir
D. shipment

单项选择题For a limited time only, this exquisite collector's item will be offered at forty percent off of the original ().

A. price
B. piece
C. challenge
D. certificate

单项选择题All international orders are () via Global Express Mail within five to ten business days.

A. spent
B. enrolled
C. collected
D. delivered

单项选择题Despite the delayed release of their digital video recorders, Vibrant Electronics' share () to grow.

A. continue
B. continues
C. continuing
D. to continue

单项选择题More and more people have lost their jobs and become ().

A. rich
B. strong
C. fragile
D. lazy