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. There wasn't _________ there at all.

2. Which is correct ?

3. How do you spell it?

4. Which is the correct spelling?

5. Doesn't ________ care?

6. Which is the correct spelling?

7. What's the spelling ?

8. He's always ________ behind people's backs.

9. Which can used with a negative verb?

10. Shouldn't we ask _________ for help?

English Test

1. ESL-EFL Test - 135
2. ESL-EFL Test - 136
3. ESL-EFL Test - 137
4. ESL-EFL Test - 138
5. ESL-EFL Test - 139
6. ESL-EFL Test - 140
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  • Precautions while using Centrifuge

    High speed centrifuges

    High speed centrifuges pose additional hazards due to the higher stress and force applied to their rotors and tubes. In addition to the safety guidelines outlined above, follow these guidelines for high speed centrifuges: 1 Filter the air exhausted from the vacuum lines. 2 Keep a record of rotor usage, in order to avoid the hazard of metal fatigue. 3 Frequently inspect, clean, and dry rotors to prevent corrosion or other damage. 4 Follow the manufacturer s operating instructions exactly.

    Chourishi Systems