swim (现在分词)_____________

用所给词的正确形式填空。
【小题1】We should stop _________ (throw) rubbish into rivers.
【小题2】In the past, the Earth _________ (be) clean and beautiful.
【小题3】My brother is __________ (plant) trees in the backyard.
【小题4】The Earth __________(get) sick now.
【小题5】We shouldn’t __________ (cut) down so many trees.

Ryan’s rabbit _______ a race now. (  )

A．running

B．is run

C．is runing

D．is running

写出下列单词的正确形式。
1. grow(三单形式)---_____________
2. swim(现在分词)---__________
3. camp(现在分词)---_____________
4. close(反义词)---_______________
5. student(复数形式)---____________
6. trip(复数形式)---_______________

用括号里单词的适当形式填空
1. When I am ________ (do) my homework, my mother is ________ (cook).
2. He has to _________ (travel) the country in search of work.
3. How __________ (do) seeds travel?
Seeds _________ (travel) in many ways.
4. What _____ (be) they talking about?
They are _________ (talk) about the seeds of plants.