Условие задания:

3 Б.
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 went to the shop last week. I _____ buy some food.
3. We did an exam yesterday. We ______ answer six questions out of ten.
Raymond Murphy. English grammar in use- Cambridge: CUP, 379p.