介词填空。 |
1. They are used _____ seeing in the dark. 2. They were invented _____ 1863. 3. George wanted _____ make the customer happy. 4. Potato chips were invented _____ a chef called George Crum. 5. He was boiling drinking water _____ an open fire. 6. Some leaves _____ a nearby bush fell _____ the water and remained there for some time. 7. This beverage was discovered _____ three thousand years before that. |