用be used to,be used for,be used by,be used as,be used in 的适当形式填空
1.Knives_________cut things.
2.Wood can_________making paper.
3.French__________Frenchmen and it_________Europe usually.
4.The book can_________a textbook.
5.This kind of machine_________farmers for getting in crops.
第2题到底是be used for 还是be used