The sign reads “In case of_________fire，break the glass and push_________red button”.

A./；a                   B./；the                C.an;a                   D.a;a

The sign reads “In case of __________ fire，break the glass and push _________ red button．”

1. A.
   不填；a
2. B.
   不填；the
3. C.
   the；the
4. D.
   a；a

The sign reads “In case of __________ fire，break the glass and push _________ red button．”

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The sign reads “In case of __________ fire，break the glass and push _________ red button．”

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