I promise ___________ on time. I mustn’t _________ late.
big – be
to be – to be
be – be
be – big be
Correct answer: A
Knowledge: The form of the verb
Explain: promise to do sth: promise to do
Mustn’t + V (bare): not allowed to do anything
Translated: I promised to be on time. I’m not allowed to be late
Choose to be – be.