The sign _____ “In case of _____ fire, push _____ red button.” [ ]

_________ a certain doubt among the students as to the necessity of the work.

What is the boy’s plan for the coming vacation— He expected it with his grandparents.

Which month has _________ days in a year— February.

More and more teaching _______ are being developed across the globe, which are sure to _______to make classroom teaching more lively and interesting. [ ]