完形填空
A father and a son went to a kite-flying festival. The son was happy 1 he saw the sky filled with colourful kites. He wanted to fly a kite too. The father then bought a kite 2 his son.
The son started to fly the kite. Soon， 3 kite was high up in the sky. After a while，the son said，“Father，it seems that the string(线) is stopping the kite from 4 higher. If we cut it，it will be free and fly even 5. Can we cut it?” The father 6 the string of the reel(线轴). The kite started to go higher. This made the little boy 7.
But then， 8， the kite started to come down. It soon 9 to the ground.
The son was surprised 10 this. He asked his father，“I thought that after cutting the string，the kite would fly higher. 11 did it fall down?”
The father explained，“The 12 was not stopping the kite from going higher，but was helping it stay in the sky. You helped the kite go up in the 13 direction(方向) using the string. But when you cut the string，it could no longer 14 the kite.”
In our 15，we may sometimes feel like there are certain things that are dragging(拖拽) us back and stopping us from growing. But in fact，these might be the things that support us the most.
（ ）1. A. what B. where C. when D. while

（）2. A. to B. for C. with D. at

（）3. A. his B. her C. him D. them

（）4. A. walking B. flying C. jumping D. throwing

（）5. A. high B. slowly C. more slowly D. higher