Quizzes, tests, exercises and puzzles for English as a Second Language (ESL), English as a foreign language (EFL), Teaching EFL (TEFL), Test of EFL (TOEFL), English for speakers of other languages (ESOL), Teaching ESOL (TESOL), TOEIC.

1. She said that no one _________ to the meeting last week.

2. There ________ some stuff left.

3. She said it _________ raining when she got here.

4. She promised she _________ do it by the end of the week and then let me down.

5. They did a great _________ fixing my computer.

6. There ________ two possible answers.

7. I'm going to take a year out to ________ round the world.

8. Let's try to make the best of a bad ________

9. My ________ to work takes an hour.

10. She asked if she ________ leave early.

English Test

1. ESL-EFL Test - 103
2. ESL-EFL Test - 104
3. ESL-EFL Test - 105
4. ESL-EFL Test - 106
5. ESL-EFL Test - 107
6. ESL-EFL Test - 108
7. ESL-EFL Test - 109
8. ESL-EFL Test - 110
9. ESL-EFL Test - 111
10. ESL-EFL Test - 112
11. ESL-EFL Test - 113
12. ESL-EFL Test - 114
13. ESL-EFL Test - 115
14. ESL-EFL Test - 116
15. ESL-EFL Test - 117
16. ESL-EFL Test - 118
17. ESL-EFL Test - 119
18. ESL-EFL Test - 120
19. ESL-EFL Test - 121
20. ESL-EFL Test - 122
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  • Simple Science

    Cooling by Expansion

    General Properties of Gases:
    If a gas expands suddenly, its temperature falls; for example, if a mass of gas at 87 C. is allowed to expand rapidly to twice its original volume, its temperature falls to 0 C. If the compressed air of a bicycle tire is allowed to expand and a sensitive thermometer is held in the path of the escaping air, the thermometer will show a decided drop in temperature.

    The low temperature obtained by the expansion of air or other gases is utilized commercially on a large scale. By means of powerful pistons air is compressed to one third or one fourth its original volume, is passed through a coil of pipe surrounded with cold water, and is then allowed to escape into large refrigerating vaults, which thereby have their temperatures noticeably lowered, and can be used for the permanent storage of meats, fruits, and other perishable material. In summer, when the atmospheric temperature is high, the storage and preservation of foods is of vital importance to factories and cold storage houses, and but for the low temperature obtainable by the expansion of compressed gases, much of our food supply would be lost to use.

    Chourishi Systems