Arrange the following words/phrases in the correct order to make meaningful sentences

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Part 2: Arrange the following words/phrases in the correct order to make meaningful sentences
25. If / go on /we / littering // the environment/ become /will/seriously /polluted
26. The old man / slowly / walked /to / the park.
27. Nam/ wet / got/he /because / forgot / his / umbrella.
28. I/ collecting / suggest / some / money.
29. I'm/ that / excited /I/ go to / Da Lat/ can / this time
30. She /to / watch /wants / the / weather forecast.