Can you check the following?
Past Perfect Tense
1. My teacher __ us three chapters, but I only finished one of them. (assign)
answer:had assigned
2. Before their fossils __, we knew nothing about dinosaurs. (discover)
answer:had been discovered
3. The team celebrated because they __ the state championship. (win)
answer:had won
4. The judge __ Jordan's entry before reading through it. (reject)
answer:had rejected
Future Perfect tense
5. By the time the press arrives, the mayor __ his speech. (memorize)
answer:will have memorized
6. Andre __ three cars by this afternoon. (sell)
answer:will have sold
7. By the time I get home, I __ your phone number (forget)
ansewr:will have forgotten
8. After seeing the movie, you __ your mind about the war (change).
answer:will have changed
Present Perfect tense
9. I __ a cash register before. (use)
answer: have used
10. Alexis __ for school already. (leave)
answer:has left
11. The manager __ to her group about the new charges. (speak
answer:has spoken
12. This town __ ever since the steel mill opened. (grow)
answer:has grown