Tenses, active or passive, participles

Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!

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).