It is

important for the model _______ accurate but simple enough.

This scientist was supposed ____ this problem, using some

non-traditional approach. 

Studies of the atmosphere show

that temperature does not decrease as _______ .

We’ll be able to carry out

experiments at the laboratory if we ____ necessary fundamental knowledge.

Neutrons do not occur in

nature and if they did, we _______them since they carry no electric charge.

 _____ is essential

, to engender a level of trust and

credibility in the outcomes of the

We cannot trust the results of a research

project if

we suspect that _____ have not acted with integrity.

The next meeting ______ on June 10^th.

What a pity, John won't come.

He ______

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