题目内容

The companies are working together to create _____ they hope will be the best means of transportation in the 21st century.

A. which
B. that
C. what
D. who

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The last time we had great fun was ______ we were visiting the Water Park.

A. where
B. how
C. when
D. why

Students are always interested in finding out _____ they can go with a new teacher.

A. how far
B. how soon
C. how often
D. how old

Tomorrow is Tom's birthday. Have you got any idea _____ the party is to be held?

A. what
B. which
C. that
D. where

We can't figure out ______ quite a number of insects, birds, and animals are dying out.

A. that
B. as
C. why
D. when