根据题目要求完成下列任务。用中文作答。
下面是两位教师为学生布置的作业。
Teacher 1
Step 4: Homework
 1. Write new words and phrases on the notebook.
 2. Finish exercise 3 on Page 21. (Text book)
 3. Finish exercises on Page 20-24. (Exercise book)
Teacher 2
Step 4: Homework
 I. Find some relative information abouttoday′s lesson on the Internet.
 2. Share your findings with your group members and present to the wholestudents next class.
根据上面的信息，从下面三个方面作答：
(1)布置作业有什么意义?(8分)
(2)分析两位教师布置作业的特点，并指出其不足之处。(10分)
(3)教师在布置作业时应注意哪些问题(至少四个方面)?(12分)