1.What are you doing / reading?
2.I'm sorry to hear that.
3.What should we do (to help improve our environment)?
4.we should save water / we shouldn't pollute water.
5.Would you like to join us?
(答案不唯一)
1.What are you doing / reading?
2.I'm sorry to hear that.
3.What should we do (to help improve our environment)?
4.we should save water / we shouldn't pollute water.
5.Would you like to join us?
(答案不唯一)