Complete the sentences. Use the future perfect form of the verbs in brackets.
1 Harry and Luke are going travelling for a month, but they _________ (return) before September.
2 They're building a new football stadium, but they _________ (not finish) it in time for next season.
3 I've sent grandad a postcard, but he _________ (not receive) it by the time we get home.
4 By this time next year, we _________ (do) all our exams.
5 Don't call for me before 7 p.m. because I _________ (not have) time to get changed.
6 When my dad retires next month, he _________ (be) with the same company for 36 years.