The key answer of exercise 3

1

1. In July people will be shopping there.
2. By Christmas, the centre will have been operating for six months.

2

1. At 11 p.m. the first horror film will have finished.
2. By midnight, the audience will be watching the second film./By midnight, the audience will have watched the second film.
3. By 4 a.m., the audience will have been sitting in the cinema for eight hours.