cExams.net
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. I've got some work left ________


2. If a person exploits someone, they trade that person up.


3. I've never been ________ the United States


4. I've ________ all the arrangements


5. I've never seen a ________ body.



6. I've thought a lot _________ them recently.


7. If a building is torn down, it is demolished.


8. If a document is leaked, ________


9. I've just seen that film you were talking about


10. If a person resigns from their job to let someone else fill the position, they step down.


English Test

1. ESL-EFL Test - 28
2. ESL-EFL Test - 29
3. ESL-EFL Test - 30
4. ESL-EFL Test - 31
5. ESL-EFL Test - 32
6. ESL-EFL Test - 33
7. ESL-EFL Test - 34
8. ESL-EFL Test - 35
9. ESL-EFL Test - 36
10. ESL-EFL Test - 37
11. ESL-EFL Test - 38
12. ESL-EFL Test - 39
13. ESL-EFL Test - 40
14. ESL-EFL Test - 41
15. ESL-EFL Test - 42
16. ESL-EFL Test - 43
17. ESL-EFL Test - 44
18. ESL-EFL Test - 45
19. ESL-EFL Test - 46
20. ESL-EFL Test - 47
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  • Precautions while using Centrifuge

    Specific guidance

    Follow these guidelines when working with a centrifuge: 1 When loading the rotor, examine the tubes for signs of stress, and discard any tubes that are damaged. 2 Inspect the inside of each tube cavity or bucket. Remove any glass or other debris from the rubber cushion. 3 Ensure that the centrifuge has adequate shielding to guard against accidental flyaways. 4 Use a centrifuge only if it has a disconnect switch that deactivates the rotor when the lid is open. 5 Do not overfill a centrifuge tube to the point where the rim, cap, or cotton plug becomes wet. 6 Always keep the lid closed during operation and shut down. Do not open the lid until the rotor is completely stopped. 7 Do not brake the head rotation by hand. 8 Do not use aluminum foil to cap a centrifuge tube. Foil may rupture or detach. 9 When balancing the rotors, consider the tubes, buckets, adapters, inserts, and any added solution. 10 Stop the rotor and discontinue operation if you notice anything abnormal such as a noise or vibration. 11 Rotor heads, buckets, adapters, tubes, and plastic inserts must match.


    Chourishi Systems