1 Choose the correct option to complete the sentences. 1 This time tomorrow, we will have sat / be sitting on the beacht 2 By next weekend, we will have done / be doing all our exams. 3 The builders have promised they'll have finished / bo finishing the job by Friday. 4 Do you think you will still have worked / be working when you're 70? 5 In 2050, 11 billion more people will have lived / be living in the world 6 By the time I'm 30, l'I have bought I be buying a house.​