2 ★ Fill in: breathe, observing, repeat, separate, struggle. 1 For this study, the psychologist will ......... the girls from the boys. Although I ........ 2 in chemistry. 3 The air we ............... in physics, I do very well is actually 78% nitrogen and only 21% oxygen. ...... their experiments again and again to make sure the results are valid. 4 Scientists have to 5 Biologists have to be patient while they're .... animals in the wild.

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1. For this study, the psychologist will **separate** the girls from the boys. Although I **struggle**.

2. **Breathe** in chemistry.

3. The air we **observe** in physics, I do very well. It is actually 78% nitrogen and only 21% oxygen. **Repeat** their experiments again and again to make sure the results are valid.

4. Scientists have to **repeat**.

5. Biologists have to be patient while they're **observing** animals in the wild.