Fill in the Blanks Presente SimpleOnline version Write the correct form of the verb be. by Laura Guatavita 1 am is is is are I are are isn't are am is is Today Monday . It the first day of school . Mr . Alvarez and his studens in class . The re twenty studens and twenty - one desks . One desk for Mr . Alvarez . " How old you , Brandon ? " asks Mr . Alvarez . Brandon . sixteen years old . The students all 16 or 17 years old . Mr . Alvarez seventeen years old . He thirty - five . It his birthay today . " I thirty - five years old today , " says Mr . Alvarez . The studens say , " Happy Birhday , Mr Alvarez ! "