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eat up give away do without deal with
to; by by; to for; to in; on
access passage way approach
leave left to leave leaving
W2﹣．X+ X+．Y3+ Y3+．Z2﹣ X+．Z2﹣
added up added added to added up to
to have made making to make to be making
came was coming had come would come
石英只能用于生产光导纤维
从海水中提取物质都必须通过化学反应才能实现
为了增加食物的营养成分，可以大量使用食品添加剂
“地沟油”禁止食用，但可以用来制肥皂
are crazy about have been crazy about were crazy about had been crazy about
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