Choose the correct answer. Mike ... me a present last week.

The correct answer is "didn't buy". Here's why: * The sentence describes an action that happened in the past ("last week"). * "didn't" is the auxiliary verb used to form the negative past simple tense. * After "didn't", we use the base form of the verb, which is "buy". Therefore, the correct sentence is: "Mike didn't buy me a present last week." Correct answer: didn't buy