Complete the sentences below. Write NO MORE THAN THREE WORDS for each answer. Students need a front door key between【T15】___

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问题 Complete the sentences below.
Write NO MORE THAN THREE WORDS for each answer.
Students need a front door key between【T15】______AND______.
In an emergency, students should use【T16】______
Fees also cover some【T17】______charges.
【T16】