用beusedto,beusedfor,beusedby,beusedas,beusedin的适当形式填空
1.Knives_________cutthings.
2.Woodcan_________makingpaper.
3.French__________Frenchmenandit_________Europeusually.
4.Thebookcan_________atextbook.
5.Thiskindofmachine_________farmersforgettingincrops.
第2题到底是beusedfor还是beused