Complete the sentences with the given words in their proper forms（用括号中所给单词的适当形式完成下列句子）：
【小题1】You must finish your homework ____________ (one).
【小题2】Hurry up! Miss Yang is waiting at the ___________ (enter).
【小题3】This coffee shop is ___________ (open) around the clock. You can buy things at any time.
【小题4】_____________ (final), they had afternoon tea together in this hotel.
【小题5】They are talking to our class teacher in ____________ (teacher) office.