1. By the time you arrive, I (write) the essay.

WILL HAVE WRITTEN

2. By this time tomorrow they (visit) Paris.

WILL HAVE VISITED

3. By the time he intends to get to the airport, the plane (take) off.

WILL HAVE TAKEN

4. By the year 2012 many people (lose) their jobs.

WILL HAVE LOST

5. I know by the time they come to my house this evening, I (go) out for a walk.

WILL HAVE GONE

6. I hope they (finish) building the road by the time we come back next summer.

WILL HAVE FINISHED

7. By 2020, the number of schools in our country (double).

WILL HAVE DOUBLÉ

8. These machines (work) very well by the time you come back next month.

WILL HAVE WORKED