Fill in the missing words from the following sentences. you can use either of these words: make, let, cause, force.
1. the copy button. . . . .the photocopier copy drawings and/or writing on the original 2. the air valve . . . . . .the air in or out of the container 3. the heat. . . . . .the air to compress. 4. humidity . . . . . the metal to rust. 5. the intake valve. . . . . .the combustible mixture enter the cylinder. 6. the spark plug . . . . . . the compressed air and gas to burn. 7. a great volume of steam . . . . . the boiler to brust 8. cold water . . . . . the steam condeses rapidly 9. a great compression in a diesel engine . . . . . the air to become hot 10. in alage power plant the steam . . . . . . the turbines move.
2. lets
3. causes
4. causes
5. makes
6. causes
7. causes
8. makes
9. causes
10. makes
2. causes
3. causes
4. causes
5. makes
6. causes
7. causes
8. makes
9. causes
10. make