PDF chapter test TRY NOW

Read these sentences and choose have to, has to or had to. Write one variant into each sentence.
Don’t use capital letters and full stops.
  
1. Mary is studying literature. She _____ read a lot of books.
 
   
 
2. I ____ walk last Sunday. There were no trams.
 
   
   
3. We did an exam yesterday. We ______ answer six questions out of ten.
 
   
Reference:

Raymond Murphy. English grammar in use- Cambridge: CUP, 379p.