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Question 1:
Tracey forgot _________ (to lock) the door. She spent the day trying to remember that fact. So she called her neighbour to ask him to check the door.
A. to lock
B. locking
Feedback Some verbs can be used both with the Gerund and the Infinitive. But in some cases the meaning of the sentence becomes different. Compare: forgot to lock - forgot that she needed to lock / forgot locking - she locked the door but she forgot that fact.
C. locks
D. locked

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Test 2-Gerunds and Infinitives | Upper-Intermediate English