Maxwell is rescuing people from plague.

Your first step is to equip Maxwell with plague fighting gears:
Round 1: Space Suit
Round 2: Gas Mask
Round 3: Oxygen Tank

Grab the rat and give to the doctor on the left. Create the following sets of items to help the doc discover the cure.

Round 1: Syringe
Round 2: Flask
Round 3: Microscope

You will then automatically receive the cure. Head to the right and give the cure to the girl to receive the mastery reward.

Scribblenauts Remix 10-7 Cheats Hints gallery:
10-7-1-a: Protect Maxwell from the plague.
10-7-1-b: Equip Maxwell with protective gear.
10-7-1-c: Give Maxwell something to wear to keep out disease.

10-7-2-a: Give the doctor an infected specimen to examine.
10-7-2-b: The rats are infected.
10-7-2-c: Bring an infected rat and give it to the doctor.

10-7-3-a: Help the doctor find a cure!
10-7-3-b: The doctor needs something to examine the rat.
10-7-3-c: Give the doctor a piece of medical equipment.

10-7-4-a: Cure the girl!
10-7-4-b: Give the girl the cure from the doctor.
10-7-4-c: Bring the potion bottle to the girl.