问题补充：
The future of developing countries the hands of children, which is education and training for young people is important.
A. lies in/why
B. is put/ because
C. is laid/ the reason
D. depends on/why
答案：
(答案→)A. lies in/why
B. is put/ because
C. is laid/ the reason
D. depends on/why
解析：
此题意为：发展中国家的未来掌握在孩子的手中，这就是教育和培养年轻人是非常重要的原因。故选A.
