1.If I were you,I would use energy efficeient light bulbs.(if 2)
2.He came up with a great idea for our enviromental project.(came up with:xuất hiện,nghĩ ra)
3.Beacuse of being absent from the meeting,she didn't know the resolution.(becasue of+N/V-ing)
4.If I have enough time,I will take part in volunteer program.(if 1)
5.If we don't reduce our plastic watse,we'll threaten our own existence.(if 1)
