Read the given sentences and choose the verbs that agree with the nouns.
I ______ be there at the office before the meeting starts.

The correct answer is: Have to

'I have to be there at the office before the meeting starts'. Sometimes 'have to' can be used to speak about responsibilities. It is used for responsibilities at work and every day life. Use 'have to' in past, present, and future to express responsibility or necessity.