Упражнение 20. Fill in have to/has to, don039;t / doesnt have

Упражнение 20. Fill in have to/has to, don't / doesnt have to, etc 1. Sandy________ buy any milk. Her sister melody has already bought it. 2. I dont have a pencil. I________ ask somebody for a pencil. 3. Nick is studying literature. He______ read a lot of books. 4. ______ you______learn the poem by heart? No, I know it. 5. I_________ clean the blackboard. Tim has already cleaned it.