This question is difficult for me to answer.
A. such
B. too
C. enough
D. So
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English is difficult for me to learn well.
A. such
B. too
C. enough
D. So
their ladders were not long to reach the people who were trapped.
A. such
B. too
C. enough
D. So
He isn’t old to go to school.
A. such
B. too
C. enough
D. So
He is young to go to school.
A. such
B. too
C. enough
D. So