Fill in the blanks with the correct tense of the verb .Each sentence uses one pair of verbs

I. Fill in the blanks with the correct tense of the verb .Each sentence uses one pair of verbs
Ask/ come                  Catch/leave                break/get
go/invite.        ring/be           make/buy.       be/hurry.  
learn/be.        have/buy          understand/help
1.I     no money left if I      that expensive book
2.Alex        late if he (not)          up!
3.If you (not)           I        you with the exercise
4.Greg        the train if he.          soon
5.(you)          to the party if they          you?
6.The bell.          if there      a fi're
7.The bike       if all three of you.      on it 
8.If you(not)         how to use a computer it.      hard to find a job
9.(your sister)           a pullover for me if I       the wool
10.If I        him nicely i think he.      to the mmovies with me