They___have arrived at lunchtime but their flight was delayed
We will wait for further information, you should keep us ________.
These houses are sold at such a low price _______ people expected.
She _______ me ______ her parents as I met them for the first time.
Only by hard working can you _______ the goal.
This kind of exercise is most _______, and therefore is a good test of your students’ ability.