Two weeks ago Sally (to invite) by some friends to the Australian outback. (not, to know) that such an excursion (must, to prepare) well she (to agree). Unfortunately they (not, to tell) anybody where they (to go). (to promise) their parents that they (will, be back) after a week, they (not, to worry). (to think) that one of the friends (to have) a cell phone with him they (not, to think) that something (may) go wrong. But unfortunately Tom (to leave) his cell phone at home. So when they (to have) a breakdown nobody (can, to inform). (not, to know) which way to go they (not, to know) what to do. So they (sit down) (to wait) and (to hope) that somebody (will, come) and (to help) them. They (be lucky). They (to see) by a pilot of a plane and so they (can, rescue).