4. Jerry (be) thirsty, he (drink) all the water.

Jerry was thirsty, he drank all the water.
Explanation: The verb 'be' is an irregular verb. In Past Simple, 'be' becomes 'was' (for singular subjects like Jerry) or 'were' (for plural subjects). The verb 'drink' is also an irregular verb and its past simple form is 'drank'. Since the subject is 'Jerry' (singular), the correct form of 'be' is 'was'.