题目：
多选题
In "task-based" teaching, good tasks should have the following qualities:
- A. They are challenging, yet not excessively demanding.
- B. They involve learners, with their own personalities and attitudes being central.
- C. They raise learnersˊ awareness of the process of language use, and encourage them to reflect on their own language use.
- D. They give learners flexibility in resolving problems.
- E. They encourage learners to attend to meaning and to purposeful language use.
答案：
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