Ⅰ. 根据句意及首字母或汉语提示完成单词(10分)
1. The r_____ of the trees go deep into the ground.
2. The young man has a large family to f_____.
3. We often p_____ young trees in spring every year.
4. Can you _____ (借) me your pen? I want to write a letter.
5. Let us go back to the subject we were _____ (讨论).