XIII. Supply postpositions where necessary: 1. The nurse filled … the patient’s card when she took my temperature. 2. We have called … a physician as my sister’s condition became considerably worse. 3. The significance of oxygen for the development of aerobic microorganisms has been found … by the microbiologists. 4. The prominent Russian physiologist Pavlov carried … many experiments to determine the nature of conditioned reflexes.

1. The nurse filled in the patient's card when she took my temperature.
Explanation: In this sentence, we use the postposition "in" after the verb "filled" to indicate that the nurse completed the information on the patient's card.

2. We have called in a physician as my sister's condition became considerably worse.
Explanation: In this sentence, we use the postposition "in" after the verb "called" to indicate that we requested the presence or assistance of a physician.

3. The significance of oxygen for the development of aerobic microorganisms has been found out by the microbiologists.
Explanation: In this sentence, we use the postposition "out" after the verb "found" to indicate that the microbiologists discovered or determined the significance of oxygen.

4. The prominent Russian physiologist Pavlov carried out many experiments to determine the nature of conditioned reflexes.
Explanation: In this sentence, we use the postposition "out" after the verb "carried" to indicate that Pavlov conducted or performed the experiments.