1, If we recycle more , we ( help) will help the earth.
2, Factories ( not dump) don't dump waste into rivers.
3, If (people ) people to work by bus , there will be fewer car fumes.
4, We ( save) will save thousands of trees If we ( not wast) don't wast paper.
5, If we ( use) use water carefully , more people ( have) will havefresh water.
6, If I ( know)know. EL I would study abroad.
7, If she ( have)has time, she could finish her test.
8, I ( run)will run a way If I saw a ghost now.
9, If you invited her . She (come) will come to the party.
10,If my father had a car . He ( drive)will drive to work.