1. I see how they conduct experiments in our laboratory.
2. It would be impossible to maintain combustion if reduced in air
oxygen up to a certain level.
3. Carbon, which occurs in nature, is usually in a bound
condition.
4. It was this teacher who insisted on conducting an experiment in our
laboratory.
1I can see them doing experiments in our lab
2It would be impossible to support combustion, if we reduce in the air
oxygen to a certain level.
3The carbon that occurs in nature is usually in a bound
condition.
4This teacher insisted on conducting the experiment in our
laboratories.