Science and technology are developing ______ quickly that some new electronic products are out-of-date within several months. 
#92298
A
very
B
so
C
such
D
too
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They did not find _____ to prepare for the worst conditions they might meet.
#94773
A
worth their while
B
it worthwhile
C
it worth
D
it worthy
I often visit my parents, who live in the countryside  whenever ____.
#92836
A
I am convenient
B
it will be convenient to me
C
I will be convenient
D
it is convenient to me