Choose the future perfect or the future perfect continuous.
1. By the time dad gets to the airport, we ______ for over three hours!
2. By the time she takes her medical board exams in July, Angela _____ a total of 25 practice exams.
3. Next month, Anthony _____ Spanish at this school for 30 years.
4. By the time our visitors from England come next week, we _____ construction on our new house.