3 Put the verbs in brackets into the correct form, future perfect simple or the future continuous. 1 By the end of this century, they (introduce) three-hour flights from Europe to Australia. 2 Do you think that, by the time we're adults, someone (invent) a time travel machine? 3 In a few hundred years, we (all/go) on holiday to other planets every year. 4 I hope that we (not/still/use) petrol in cars in 50 years' time. 5 I hope they (find) a more environmentally friendly fuel by then.
my mother is a jigsaw and she is very smart and she doesn't